Update astropy-helpers to v0.4.3
Update reproject after upstream API change
Merge pull request #211 from cdeil/ah-update

Update astropy-helpers to v0.4.3
Merge pull request #210 from adonath/restructure_containment_measure

Restructured image measurement functions
Bundle xmltodict.py in gammapy/extern
Merge pull request #212 from cdeil/xmltodict

Bundle xmltodict.py in gammapy/extern
Print optional package version numbers in test output
Merge pull request #214 from cdeil/issue-214

Print optional package version numbers in test output
PEP8 cleanup: change `== None` to `is None`
Restructured TS map computation