bump version of grit_ext
Merge pull request #3377 from SaitoWu/grit_ext

bump version of grit_ext
Added memory requirements based on https://news.ycombinator.com/item?id=5423851
Combine it with the memory requirements that where already there.
Corrected mistake, added hint for windows users.
Better header and detail why you need two times the storage. Also moving memory and storage to the bottom, OS is more important.
Updating based on Dmitriy his comments.
Use NotificationService for observers pt1
NotificationService for resolving email notification logic
notification level for user
reject current_user from close issue emails
fixed tests
Spork support added
refactor issue observer spec
enable callbacks for specs after notification
Merge pull request #3398 from Andrew8xx8/spork

Spork support added
Update travis config