Rename externs/html5.js to externs/closure-compiler.js

Add add a fix for issues:
  * https://code.google.com/p/closure-compiler/issues/detail?id=1084
  * https://code.google.com/p/closure-compiler/issues/detail?id=1088
Merge pull request #1 from fredj/deviceorientation-ios

Rename externs/html5.js to externs/closure-compiler.js