fix(CHANGELOG): anchor tag for v2.0.7 was wrong
WIP: rearranging all tasks
chore(grunt): Customize grunt tasks

SauceLabs and multi-angular configs are now built automatically. This will
make is easier to add more angular versions and more custom browsers down
the road without having to rewrite tasks.
chore(grunt) Update karmangular and dev tasks

Add documentation to the README on how to use the dev and karmangular
tasks, as well as SauceLabs testing.