feat(uiSrefActive): Also activate for child states.

feat(uiSrefActive): Also activate for child states.

To limit activation to target state use new ui-sref-active-equals directive'

Breaking Change: Since ui-sref-active now activates even when child states are active you may need to swap out your ui-sref-active with ui-sref-active-equals, thought typically we think devs want the auto inheritance.

Fixes #818