fix placeholder text for notes
fix placeholder text for semantic blocks
fix troubleshooting code in semantic blocks
Merge pull request #51 from oerpub/ticket-525

fix placeholder text in chrome and firefox
Merge remote-tracking branch 'origin/master' into ticket-364

Conflicts:
	src/plugins/oer/note/lib/note-plugin.coffee
	src/plugins/oer/note/lib/note-plugin.js
use fixed selector for examples
make exercises display properly for unrecognized types
Merge branch 'ticket-364' into testing

Conflicts:
	src/plugins/oer/note/lib/note-plugin.coffee
	src/plugins/oer/semanticblock/lib/semanticblock-plugin.coffee
	src/plugins/oer/semanticblock/lib/semanticblock-plugin.js