🐛 The regular expression for determing text that is bold was greedy

One of the problems at GitHub that we saw when rending a markdown file
with some code blocks is that when there was an unclosed block, it will
highlight the rest of the remaining text as bold, overriding any
highlights that should take effect.

This test change is based on a refactoring that was done to group
together the patterns and also change the regex for bold to match the
one used in `burodepeper/language-markdown` which is also an atom
package for syntax highlighting

spec/gfm-spec.coffee

@@ -71,20 +71,19 @@ describe "GitHub Flavored Markdown grammar", ->
 
   it "tokenizes **bold** text", ->
     {tokens} = grammar.tokenizeLine("**bold**")
-    expect(tokens[0]).toEqual value: "**", scopes: ["source.gfm", "markup.bold.gfm"]
+    expect(tokens[0]).toEqual value: "**", scopes: ["source.gfm", "markup.bold.gfm", "punctuation.definition.entity.gfm"]
     expect(tokens[1]).toEqual value: "bold", scopes: ["source.gfm", "markup.bold.gfm"]
-    expect(tokens[2]).toEqual value: "**", scopes: ["source.gfm", "markup.bold.gfm"]
+    expect(tokens[2]).toEqual value: "**", scopes: ["source.gfm", "markup.bold.gfm", "punctuation.definition.entity.gfm"]
 
-    [firstLineTokens, secondLineTokens] = grammar.tokenizeLines("this is **bo\nld**!")
-    expect(firstLineTokens[0]).toEqual value: "this is ", scopes: ["source.gfm"]
-    expect(firstLineTokens[1]).toEqual value: "**", scopes: ["source.gfm", "markup.bold.gfm"]
-    expect(firstLineTokens[2]).toEqual value: "bo", scopes: ["source.gfm", "markup.bold.gfm"]
-    expect(secondLineTokens[0]).toEqual value: "ld", scopes: ["source.gfm", "markup.bold.gfm"]
-    expect(secondLineTokens[1]).toEqual value: "**", scopes: ["source.gfm", "markup.bold.gfm"]
-    expect(secondLineTokens[2]).toEqual value: "!", scopes: ["source.gfm"]
+    [firstLineTokens, secondLineTokens] = grammar.tokenizeLines("this is **not\nbold**!")
+    expect(firstLineTokens[0]).toEqual value: "this is **not", scopes: ["source.gfm"]
+    expect(secondLineTokens[0]).toEqual value: "bold**!", scopes: ["source.gfm"]
 
     {tokens} = grammar.tokenizeLine("not**bold**")
-    expect(tokens[0]).toEqual value: "not**bold**", scopes: ["source.gfm"]
+    expect(tokens[0]).toEqual value: "not", scopes: ["source.gfm"]
+    expect(tokens[1]).toEqual value: "**", scopes: ["source.gfm", "markup.bold.gfm", "punctuation.definition.entity.gfm"]
+    expect(tokens[2]).toEqual value: "bold", scopes: ["source.gfm", "markup.bold.gfm"]
+    expect(tokens[3]).toEqual value: "**", scopes: ["source.gfm", "markup.bold.gfm", "punctuation.definition.entity.gfm"]
 
   it "tokenizes __bold__ text", ->
     {tokens} = grammar.tokenizeLine("____")