Update some colors to fix closeness.

I have used syntactic color values with respect to the table below:

A | B C | D | E | F G | H | I | J K | L M | N O | P Q | R S | T U | V W | X | Y Z
0     1     2   3     4     5   6   7      8        9      A      B     C       D    E     F

For example for Gradle the color should be 4B0283, for Cuda the color should be 1C201C(for six-letter CudaCu) and for reStructuredText the color should be B3BCBC(for six-letter reStru).

lib/linguist/languages.yml

@@ -703,7 +703,7 @@ Cuda:
   - .cuh
   tm_scope: source.cuda-c++
   ace_mode: c_cpp
-  color: "#98DB22"
+  color: "#1C201C"
 
 Cycript:
   type: programming
@@ -1210,7 +1210,7 @@ Gradle:
   - .gradle
   tm_scope: source.groovy.gradle
   ace_mode: text
-  color: "#95CB51"
+  color: "#4B0283"
 
 Grammatical Framework:
   type: programming
@@ -1778,7 +1778,7 @@ Less:
   - .less
   tm_scope: source.css.less
   ace_mode: less
-  color: "#3B5E93"
+  color: "#83BB83"
 
 Lex:
   type: programming
@@ -1988,7 +1988,7 @@ Markdown:
   - .mkdown
   - .ron
   tm_scope: source.gfm
-  color: "#EEEEEE"
+  color: "#80B729"
 
 Mask:
   type: markup
@@ -2217,7 +2217,7 @@ Nginx:
   aliases:
   - nginx configuration file
   ace_mode: text
-  color: "#11AA11"
+  color: "#9469E9"
 
 Nimrod:
   type: programming
@@ -2276,7 +2276,7 @@ NumPy:
   - .numsc
   tm_scope: none
   ace_mode: text
-  color: "#489FD9"
+  color: "#9C8AF9"
 
 OCaml:
   type: programming
@@ -3694,7 +3694,7 @@ XML:
   - Web.Release.config
   - Web.config
   - packages.config
-  color: "#36BBF3"
+  color: "#E88E88"
 
 XPages:
   type: programming
@@ -3740,7 +3740,7 @@ XSLT:
   - .xsl
   tm_scope: text.xml.xsl
   ace_mode: xml
-  color: "#1F87CE"
+  color: "#EB8CEB"
 
 Xojo:
   type: programming
@@ -3783,7 +3783,7 @@ Yacc:
   - .yy
   tm_scope: source.bison
   ace_mode: text
-  color: "#A33890"
+  color: "#F011F0"
 
 Zephir:
   type: programming
@@ -3866,7 +3866,7 @@ reStructuredText:
   - .rst
   - .rest
   ace_mode: text
-  color: "#444444"
+  color: "#B3BCBC"
 
 wisp:
   type: programming