Gutted the SlideDrawer and gave it the new interface it requires
Renders the actual elements, instead of images, into slide snapshots.
GH-187
Ignores heavyweight components when rendering snapshots.  GH-187
Removed raster based slide drawers GH-187

Need to do some performance testing on very large presentations
to see what the impact of all these changes are.
Allow the transition editor to overflow but not the main editor
Merge branch 'master' into slide-snapshots
Fixed leak of SlideDrawers
Prevented import modal from importing the current page
Disabled remotestorage until we switch to remotestorage-lite
Wrapped words on preview windows
Don't build theme css
Trigger contentsChanged when markdown changes
Added this param to event binding
Merge pull request #205 from tantaman/slide-snapshots

Updates to slide snapshots to address GH-187