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Make certain no previous imports of old versions of pkg_resources are floating around before importing the newly installed setuptools.

Load version from the file rather than by importing the module (which is subject to variance based on sys.path). Fixes #43.

Use 'is_valid' instead of simply 'valid' or 'check', which are less clear about the purpose of the method. Fixes AttributeError introduces in 0.9.2. Fixes #42.

Extracted hash-checking functionality into its own classes. Hashes are no longer checked when the proper pattern isn't detected. Fixes #42.

Re-wrote link inference to now respect specific patterns and generate links to known issue trackers.

setup.py now loads the version from setuptools/__init__.py, limiting the places where release.py must keep in sync.