- Added dependency packages 'backports.lzma' in 'requirements/main.txt'
  and 'httplib2' in requirements/test.txt
- Fixed 'full_url' method in RealHttpClient
- Fixed 'checksum' creation and added cookie in request in
  'set_image_checksum'
- Updated base.py test to run test based on docker version
- Updated test_images.py to run ancestry test and 'not_found' testcase
Removed regex based splitting of checksums in base.py
Merge pull request #1 from budhrg/rohanp/real_http_tests

Removed regex based splitting of checksums in base.py
Updated base.py to split checksums string
Merge pull request #2 from budhrg/rohanp/real_http_tests

Updated base.py to split checksums string
Fixed test_tags.py for checking tags API except delete API
Removed uncommented code and update tests for docker < 0.10