Add empty robots.txt. Fixes #780.
Merge pull request #855 from ahinz/fix/854/add-robots.txt

Add empty robots.txt. Fixes #780.
Fix issue with create_mock_system_user

System user must be saved with save_base()
Merge branch 'master' of https://github.com/azavea/OTM2
Upgrade libsass

We need libsass version 3.0, which fixes libsass issue #54
Merge pull request #869 from ahinz/fix/sass-version

Upgrade libsass
Move decorator functions out of util into separate file
Move Exceptions from utils.py into new exceptions.py
Reorder imports, add __future__ imports and utf8 comments

The __future__ imports and utf8 comments are intended to make the code
more easily Python 3 compatible
Add @wraps annotations
Merge pull request #868 from maurizi/refactorUtils

Refactor utils
Merge branch 'master' of https://github.com/azavea/OTM2