Added module exclusion support

• Added support for excluding specific modules via the --exclude (-x) flag which can be supplied multiple times. This will be reflected in the metadata.
• Added wagon showmeta -s SOURCE_ARCHIVE which prints out the metadata of a wagon archive.
• os properties in the metadata are now null when all either creating an archive on OS X or Windows or if the platform is any.
• Archive name now contains the distro and release if creating an archive on Linux which contains non-Pure-Python wheels; but, when irrelevant, archive name will be somewhat like this: cloudify_fabric_plugin-1.2.1-py27-none-any-none-none.tar.gz

More user control

• Added support for user supplied Python versions.
• Added support for an --ignore-platform flag when installing a module.
• Archive name now includes distro and release for Linux compiled archives so that they're identifiable.
• Much more documentation

Wagon Release

Moved from Wheelr to Wagon and added creation and installation validation.

First release of Wheelr

0.1

First release