feat($cordovaGA): bring in the new google analytics plugin

- add new google analytics plugin
- add unit tests
- rebuild with new changes

**BREAKING CHANGE:**

Please checkout the upcoming documentation for the
google analytics plugin on http://ngcordova.com for migration.

resolves #53
feat($cordovaGoogleAnalytics): rename ga to googleAnalytics
feat($cordovaGA): add legacy support for the old ga.js

- add legacy support for the ga.js plugin
- rebuild
Merge pull request #299 from mrzmyr/feat-new-google-analytics-plugin

feat($cordovaGoogleAnalytics): bring in the new google analytics plugin