Simplify blob tests

Now that FileBlobs with relative paths can still access their files on
disk, we can use relative paths for all FileBlobs in the test. This more
closely matches the behavior in github.com's codebase, where all blobs
use relative paths.

test/test_blob.rb

@@ -22,22 +22,14 @@ class TestBlob < Minitest::Test
     File.expand_path("../fixtures", __FILE__)
   end
 
-  def sample_blob(name, enforce_relative = false)
+  def sample_blob(name)
     name = File.join(samples_path, name) unless name =~ /^\//
-    if enforce_relative
     FileBlob.new(name, samples_path)
-    else
-      FileBlob.new(name)
-    end
   end
 
-  def fixture_blob(name, enforce_relative = false)
+  def fixture_blob(name)
     name = File.join(fixtures_path, name) unless name =~ /^\//
-    if enforce_relative
     FileBlob.new(name, fixtures_path)
-    else
-      FileBlob.new(name)
-    end
   end
 
   def script_blob(name)
@@ -271,7 +263,7 @@ class TestBlob < Minitest::Test
     assert !sample_blob("ext/extconf.rb").vendored?
 
     # Dependencies
-    assert sample_blob("dependencies/windows/headers/GL/glext.h", true).vendored?
+    assert sample_blob("dependencies/windows/headers/GL/glext.h").vendored?
 
     # Node dependencies
     assert sample_blob("node_modules/coffee-script/lib/coffee-script.js").vendored?
@@ -296,10 +288,10 @@ class TestBlob < Minitest::Test
     assert sample_blob("external/jquery.min.js").vendored?
 
     # C deps
-    assert sample_blob("deps/http_parser/http_parser.c", true).vendored?
+    assert sample_blob("deps/http_parser/http_parser.c").vendored?
-    assert sample_blob("deps/v8/src/v8.h", true).vendored?
+    assert sample_blob("deps/v8/src/v8.h").vendored?
 
-    assert sample_blob("tools/something/else.c", true).vendored?
+    assert sample_blob("tools/something/else.c").vendored?
 
     # Chart.js
     assert sample_blob("some/vendored/path/Chart.js").vendored?
@@ -309,10 +301,10 @@ class TestBlob < Minitest::Test
     assert sample_blob("codemirror/mode/blah.js").vendored?
 
     # Debian packaging
-    assert sample_blob("debian/cron.d", true).vendored?
+    assert sample_blob("debian/cron.d").vendored?
 
     # Erlang
-    assert sample_blob("rebar", true).vendored?
+    assert sample_blob("rebar").vendored?
 
     # Minified JavaScript and CSS
     assert sample_blob("foo.min.js").vendored?
@@ -323,7 +315,7 @@ class TestBlob < Minitest::Test
     assert !sample_blob("foo.min.txt").vendored?
 
     #.osx
-    assert sample_blob(".osx", true).vendored?
+    assert sample_blob(".osx").vendored?
 
     # Prototype
     assert !sample_blob("public/javascripts/application.js").vendored?
@@ -333,7 +325,7 @@ class TestBlob < Minitest::Test
     assert sample_blob("public/javascripts/dragdrop.js").vendored?
 
     # Samples
-    assert sample_blob("Samples/Ruby/foo.rb", true).vendored?
+    assert sample_blob("Samples/Ruby/foo.rb").vendored?
 
     # jQuery
     assert sample_blob("jquery.js").vendored?
@@ -398,10 +390,10 @@ class TestBlob < Minitest::Test
     assert sample_blob("public/javascripts/modernizr.custom.01009.js").vendored?
 
     # Fabric
-    assert sample_blob("fabfile.py", true).vendored?
+    assert sample_blob("fabfile.py").vendored?
 
     # WAF
-    assert sample_blob("waf", true).vendored?
+    assert sample_blob("waf").vendored?
 
     # Visual Studio IntelliSense
     assert sample_blob("Scripts/jquery-1.7-vsdoc.js").vendored?
@@ -423,7 +415,7 @@ class TestBlob < Minitest::Test
     assert sample_blob("Scripts/jquery.unobtrusive-ajax.min.js").vendored?
 
     # NuGet Packages
-    assert sample_blob("packages/Modernizr.2.0.6/Content/Scripts/modernizr-2.0.6-development-only.js", true).vendored?
+    assert sample_blob("packages/Modernizr.2.0.6/Content/Scripts/modernizr-2.0.6-development-only.js").vendored?
 
     # Font Awesome
     assert sample_blob("some/asset/path/font-awesome.min.css").vendored?
@@ -433,15 +425,15 @@ class TestBlob < Minitest::Test
     assert sample_blob("some/asset/path/normalize.css").vendored?
 
     # Cocoapods
-    assert sample_blob('Pods/blah', true).vendored?
+    assert sample_blob('Pods/blah').vendored?
 
     # Html5shiv
     assert sample_blob("Scripts/html5shiv.js").vendored?
     assert sample_blob("Scripts/html5shiv.min.js").vendored?
 
     # Test fixtures
-    assert sample_blob("test/fixtures/random.rkt", true).vendored?
+    assert sample_blob("test/fixtures/random.rkt").vendored?
-    assert sample_blob("Test/fixtures/random.rkt", true).vendored?
+    assert sample_blob("Test/fixtures/random.rkt").vendored?
 
     # Cordova/PhoneGap
     assert sample_blob("cordova.js").vendored?
@@ -455,7 +447,7 @@ class TestBlob < Minitest::Test
     assert sample_blob("foundation.abide.js").vendored?
 
     # Vagrant
-    assert sample_blob("Vagrantfile", true).vendored?
+    assert sample_blob("Vagrantfile").vendored?
 
     # Gradle
     assert sample_blob("gradlew").vendored?