[added] ic-modal-content, ic-modal-footer

to facilitate more accessible css, you must now
wrap your content in ic-modal-content
[fixed] focus from other tabs, browser chrome, etc

fixes #4

previously:

- tab switching bug
  1. focus an element in a dialog
  2. switch browser tabs/windows with the keyboard
  3. switch back
     - the old active gets blurred and the close
       button gets focus, gross.

- browser chrome to window nav

  this worked fine, but it was behind an ember.run
  which caused flickering, now its smooth as
  butter

now it all works as expected
requires ic-modal-content to look good
[added] modal-form
[fixed] cross-browser flex styles
documentation/examples, prep for release
release v0.0.4