Fix IE console methods not having apply() method

Closes #3

- Add mock functions for console methods that don't exist
- Use Function.bind to make sure console methods are Function types with
  .apply() methods
Merge pull request #4 from jgable/fixIEApplyError

Fix IE console methods not having apply() method
Merge branch 'master' of github.com:sproutsocial/cross-console
Allowing persist to be turned off
Adding some speed improvements
Updating the version