v0.7.7

Closed issues:

• Hide on click out with hasOverlay=false #55
• Addon doesn't work with ember-cli < 0.2.6 #53

Merged pull requests:

• refactor updateAlignment to make it clear what the different paths are #66 (raycohen)
• assert that specified alignment target exists #65 (kagemusha)
• Adds the ability to close when clicking anywhere outside the modal without an overlay #59 (kellyselden)
• Add version check for minimum ember-cli version #56 (lukemelia)