Added ng-model to column-selector for validation

Refactored directive html
Merge pull request #67 from alex-deaconu/master

Added ng-model to column-selector for validation
Fixing broken test case
Merge pull request #69 from alex-deaconu/master

Fixing broken test case
Merge pull request #68 from stulees/master

Scroll and Table - template and e2e test HTML updates