Change 'this' with $state in $state.go

Allow partial application of $state.go as in _.partial($state.go, ...)
Update README.md

Add npm install instructions
Restore comment in .run function call

In a previous version there was a example of how to use the $state inside a ng-class.
chore(changelog): fix changelog is just plain wrong, was showing features that aren't even released yet.
chore(changelog): fix changelog dates
Added new resource links to videos and ui-router-extras
Linked example titles to plunkrs
fix(docs): Explain return value of rule as function
Revert "Make resolved injectables from ancestor states available in descendent state resolves."

This reverts commit 10cc3f80b3e3fccf3de484807162bac8bb134005.
Merge branch 'master' of https://github.com/asperry152/ui-router