Adds basic support for the Swift programming language

Text only lexer for now until Pygments catches up

samples/Swift/section-87.swift

@@ -0,0 +1,11 @@
+func anyCommonElements <T, U where T: Sequence, U: Sequence, T.GeneratorType.Element: Equatable, T.GeneratorType.Element == U.GeneratorType.Element> (lhs: T, rhs: U) -> Bool {
+    for lhsItem in lhs {
+        for rhsItem in rhs {
+            if lhsItem == rhsItem {
+                return true
+            }
+        }
+    }
+   return false
+}
+anyCommonElements([1, 2, 3], [3])