added column to app configs
make markdown helper return blank if blank argument
add app config field for request text
add request text to view
added default text to setup task
added request text parameter to app config model
Fix grammar for David :-)
Merge branch 'release-v3.4' into 746_markdown_request_34

Conflicts:
	app/models/app_config.rb
updated consolidated schema
added CSS class well to request text
Merge pull request #925 from YaleSTC/746_markdown_request_34

resolves #746 on `release-v3.4`