chore(grunt): Made dev task run test on latest angular

- Also removed angular 1.2.0 and 1.2.1 from tests, added 1.2.5.
- Removed IE8 browsers from SauceLabs testing
- Added karmangular:latest option to run test on most recent angular
chore(GridUtil): Update tests and move to right dir

Also fixed readableColumnName() and added tests for more cases
chore(docs): WIP: updating util docs/specs