[#435] Add support for OrderedDict to python < 2.7
[#435] Use OrderedDict in sqlalchemy
[#435] fix 2.6 nose issue
[#435] Add python 2.6 to travis tests
[#435] Add python 2.5 to travis tests
Revert "[#435] Add python 2.5 to travis tests"

This reverts commit c775013efe7f975a35324e725c754b10de4d8f2d.
Merge pull request #435 from okfn/435-python-support-ordereddict

Python 2.6 support