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Fix deletion of tmp/gitlabhq-gitolite* folders in a NFS environment.

When working inside of a Vagrant box with NFS enabled, the deletion of a
repository in tmp/ doesn't work every time.

It is related to NFS inability to delete a folder if it's still used by
a resource (e.g. `rm -rf ./folder` would leave the folder and a .nfs*
    file in it). In this case it's the temporary repository which can't
be deleted because `ga_repo` is still using it.

De-allocating ga_repo is not possible (thanks Ruby), but deleting the
folder it points to in the first place fixes the issue.

Reference:
http://stackoverflow.com/questions/11228079/python-remove-directory-error-file-exists
Merge pull request #1582 from Kouno/nfs-fix

Fix deletion of tmp/gitlabhq-gitolite* folders in a NFS environment.
commit show page styled a bit
fixed some grammar stuff

Fixed a few things (wont -> won't, "a code")
all devise controller use devise layout
Merge pull request #1590 from thomwiggers/patch-1

fixed some grammar stuff
Fix double ref_type in push event when removing branch or tag
Don't link to removed ref
Fix completion for per line forms
Clarify deletion messages
Merge pull request #1594 from riyad/fix-completion-for-per-line-forms

Fix completion for per line forms
remove unnecessary step from install guide
Refactored events output. Added links to authors of events
Refactoring event views
Use class instead id for css styles
fix build
actually fix the build
#1585 Api for user creation: base implementation
#1585 Api for user creation: create help