develop branch is now 1.5.dev1
wheel: account for purelib != platlib
cleaner "don't install pypi-hosted binary wheels on linux" feature
wheel: improve unit tests
wheel: add tags parameter to support_index_min also
support mocking pip.pep425tags.supported_tags
wheel: test WHEEL "root_is_purelib" parser
mock moved attribute
Checked for options to be None in parse_requirements
Merge pull request #1025 from dholth/develop

wheel: test WHEEL "root_is_purelib" parser
add release-1.4 to travis branches
can't use easy_install to install virtualenv test req from git
Merge pull request #1027 from kevinfrommelt-wf/develop

Checked for options to be None in parse_requirements
update authors file
merge from develop
1.4rc2