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-495-new

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