Added notes about code present only to support Python 2.
Added release notes about Python 3 support.
Added instructions for uploading Windows installers (fixes #20).
Added note that Windows users can use an exe installer.
Added a note.
Fixed list of supported Python versions.
Clean up Versioneer's imports (stop pyflakes complaining).

The Versioneer files were originally automatically generated. If we upgrade
to a newer version of Versioneer, the files modified in this commit will be
regenerated, so the duplicate import statements may reappear unless fixed
by then in Versioneer itself (https://github.com/warner/python-versioneer/issues/14).
Linking to release instructions on the wiki
Deleted RELEASE.rst (now on the GitHub wiki)
Added dates to releases, and pointed back to Topographica for history.

Clarifies that param is a mature project.
Removed link to release instructions.

Keep the README relevant to users. Maybe we should add a more general
note (near the bottom) that information for developers of param is on
the github wiki?
Imported a test file from Topographica to use as a placeholder while setting up param testing.
Added Travis CI configuration file.
Added Travis CI build icon.
Removed versioneer.py and param/_version.py
Added new Version class in param/version.py
Added .gitattributes for git-archive versioning support
Updated __init__.py to use Version class
Configured setup.py to call param.__version__.verify()
Fixed bug in Version.verify method