add complete and ignore feature
use js date instead of moment in bg
update screenshot
Merge pull request #22 from PerryPan/master

初步加入完成和忽略功能
move localStorage store to a service, using filter to hide deadlines
rename courserStorage to alfredStorage
move all localStroage manipulation to alfredStorage
fix sign in bug, add update removed deadlines feature and use checkbox
fix spelling error
include node_modules in gitignore
Merge pull request #23 from PerryPan/master

修复在用户没有sign in情况下的bug ，将button改为checkbox，以及加入更新removedDeadlines
Merge branch 'grunt' into ignore_and_finish
move localStorage to alfredStorage
change display
change screenshot
Merge pull request #24 from PerryPan/master

ui change, checkbox on the right postion
add restore functionality, but failed..
fix unable to restore bug
Merge pull request #25 from PerryPan/master

加入restore removed deadline功能
update screenshot