Only load TextMate packages as needed in specs

Also: when a TextMate package is deactivated, remove its grammars

src/app/syntax.coffee

@@ -32,9 +32,14 @@ class Syntax
 
   addGrammar: (grammar) ->
     @grammars.push(grammar)
-    for fileType in grammar.fileTypes
-      @grammarsByFileType[fileType] = grammar
-      @grammarsByScopeName[grammar.scopeName] = grammar
+    @grammarsByFileType[fileType] = grammar for fileType in grammar.fileTypes
+    @grammarsByScopeName[grammar.scopeName] = grammar
+
+  removeGrammar: (grammar) ->
+    if _.include(@grammars, grammar)
+      _.remove(@grammars, grammar)
+      delete @grammarsByFileType[fileType] for fileType in grammar.fileTypes
+      delete @grammarsByScopeName[grammar.scopeName]
 
   setGrammarOverrideForPath: (path, scopeName) ->
     @grammarOverridesByPath[path] = scopeName
@@ -46,7 +51,9 @@ class Syntax
     @grammarOverridesByPath = {}
 
   selectGrammar: (filePath, fileContents) ->
+
     return @grammarsByFileType["txt"] ? @nullGrammar unless filePath
+
     @grammarOverrideForPath(filePath) ?
       @grammarByFirstLineRegex(filePath, fileContents) ?
       @grammarByPath(filePath) ?

src/app/text-mate-package.coffee

@@ -36,7 +36,8 @@ class TextMatePackage extends Package
       syntax.addProperties(selector, properties)
 
   deactivate: ->
-    # we should remove grammars and unregister properties, snippets, etc
+    syntax.removeGrammar(grammar) for grammar in @grammars
+    # we should also unregister properties, snippets, etc
 
   legalGrammarExtensions: ['plist', 'tmLanguage', 'tmlanguage']