Use term.js instead of jquery console.
Add error page demo.
Use ConsoleSessionREPL in error page
Rename ConsoleSessionREPL to REPLSession
Merge branch 'custom_binding' into error_page_demo
Use the renamed REPLSession
Make REPL session error inherit from StandardError
Add binding to REPLSession attributes
Merge branch 'custom_binding' into error_page_demo
Add binding to REPLSession attributes
Minor styling fix
Merge branch 'custom_binding' into error_page_demo

Conflicts:
	app/models/web_console/repl_session.rb