fix(chatty): Update to latest angular and fix related filter bug.

resolves #23
feat(chatty): Add tabService for managing tabs/filters.

Now able to properly access addTab method without $scope inheritance.

resolves #18
fix(chatty): Remove unused dependency.
feat(chatty): Add parent author tab (replies).

resolves #12
fix(chatty): Adjust margin for tabs, allowing more room.
feat(chatty): Add reply count in tabs display.

resolves #13