Add LiveScript to languages.json (#607)

LiveScript is a language which compiles to JavaScript.  (http://livescript.net/)

languages.json

@@ -687,6 +687,12 @@
       "nested": true,
       "extensions": ["lisp", "lsp"]
     },
+    "LiveScript": {
+      "line_comment": ["#"],
+      "multi_line_comments": [["/*", "*/"]],
+      "quotes": [["\\\"", "\\\""], ["'", "'"]],
+      "extensions": ["ls"]
+    },
     "LLVM": {
       "line_comment": [";"],
       "quotes": [["\\\"", "\\\""], ["'", "'"]],

tests/data/livescript.ls

@@ -0,0 +1,28 @@
+# 28 lines, 10 code, 12 comments, 6 blanks
+
+/*
+ * /* Nested comment
+ * #  single line comment
+ * */
+
+/*
+
+add = (a, b) ->
+  return a + b
+*/
+
+hello = ->
+  console.log 'hello, world!'
+
+"hello!" |> capitalize |> console.log
+
+# Easy listing of implicit objects
+table1 =
+  * id: 1
+    name: 'george'
+  * id: 2
+    name: 'mike'  # comment
+  * id: 3
+    name: 'donald'
+
+# Comment