refactoring lessonplans_controller test
use a image as the background of the delete button
fix the delete button display problem on scrach attachement
redirect to login page when user did not login and want to create new session
add links to the ppt
refactoring comments controller and add the test
Please run test before commit!!!
change commets table content column type to text
remove comment to publisher assosiation
refactoring tasks controller and add the controller test
Rename the contact to feedback, and add integaretion/controller test
fix conflict