Prioritize first line matches over bundled/non bundled cirteria

spec/fixtures/packages/package-with-rb-filetype/grammars/rb.cson

@@ -1,5 +1,6 @@
 'name': 'Test Ruby'
 'scopeName': 'test.rb'
+'firstLineMatch': '^\\#!.*(?:\\s|\\/)(?:testruby)(?:$|\\s)'
 'fileTypes': [
   'rb'
 ]

spec/grammars-spec.coffee

@@ -120,6 +120,8 @@ describe "the `grammars` global", ->
         atom.grammars.grammarForScopeName('source.ruby').bundledPackage = true
         atom.grammars.grammarForScopeName('test.rb').bundledPackage = false
 
+        expect(atom.grammars.selectGrammar('test.rb', '#!/usr/bin/env ruby').scopeName).toBe 'source.ruby'
+        expect(atom.grammars.selectGrammar('test.rb', '#!/usr/bin/env testruby').scopeName).toBe 'test.rb'
         expect(atom.grammars.selectGrammar('test.rb').scopeName).toBe 'test.rb'
 
     describe "when there is no file path", ->

src/grammar-registry.js

@@ -58,10 +58,10 @@ class GrammarRegistry extends FirstMate.GrammarRegistry {
 
     let score = this.getGrammarPathScore(grammar, filePath)
     if ((score > 0) && !grammar.bundledPackage) {
-      score += 0.25
+      score += 0.125
     }
     if (this.grammarMatchesContents(grammar, contents)) {
-      score += 0.125
+      score += 0.25
     }
     return score
   }