make designer maximize
support round-tripping
uncomment more elements
remove unused buttons
add metadata
Ignore components dir
Remove paper from metadata
modernize legal
update
add support for optional elements
Create README.md

Added a readme with a few getting started steps and a heads up about 404s
comment out core-elements/metadata; set translateZ(0) on designer to
avoid flashing when toggling checkbox
add some ad hoc code folding.
prompt for unload for backspace key
Merge branch 'master' of github.com:Polymer/designer
add super basic support for saving.
add a share button
make code folding setup less brittle
use a default github token for accessing gist
add github username for displaying gist link