Added ajax autocomplete for the directories dropdown in the policy view

tnc-ba/strongTNC#134
Added function to import swid tags from the workitems result field in the DB

Also, there is now a manage.py command to import swid tags from file
(tnc-ba/strongTNC#133)
Added trusted flag to device
Removed os.path.join to ensure windows compatibility
Configured urls for swid app
Created regid template
Implemented SWID inventory view
Disabled compiler optimizations on Travis CI
Fixed issue128 merge bug
Added ajax based paging
Fixed group assignment bugs

Bugs primarily introduced by
https://github.com/tnc-ba/strongTNC/commit/a02825e9ac318af4d1cc4b5a0c044b52746c48cd
Fixed file hashes bug

File hashes field has changed to filehash_set in the model
refactoring/merging