Fix measurement regressions in `move-over`

https://github.com/ef4/liquid-fire/issues/53#issuecomment-54738788
Merge pull request #60 from jamesreggio/jar-fix-regressions

Fix measurement regressions in `move-over`
minor bugfix release
Fix typo (#58)

Thanks to @netaisllc!
Add liquid-unless helper
Merge pull request #62 from jamesreggio/liquid-unless

Add `liquid-unless` helper
Release 0.8.3
Release 0.8.4
update ember-cli addon implementation
Merge pull request #66 from jakecraige/addon-update

update ember-cli addon implementation
Due to #66 these are now only devDependencies
Merge branch 'master' into modal
starting to extend router dsl