Refactor testsuite invocation

Move shared parts into test.core and use it in LESS, issues and
bootstrap3 auto-generated tests. This simplifies the test code and
allows to use nosetests (or any other test runner).
Drop 'pep8' tox target

We have flake8 which is a wrapper around pep8, pyflakes and mccabe.
Support publishing wheels

Lesscpy is currently pure-Python and works with both py2 and p3, so we
can publish universal wheels.

See http://pythonwheels.com/
Move bin/ to scripts/
Add 3.4 Travis-CI target
Add AUTHORS file

Generated from git changelog and removed doublets.
Use nose

The sanest way to discover and run tests across py27, py33, py34, tox
and Travis-CI and 'setup.py test'.
Bump version to 0.10

Moved to lesscpy.__version__ and use it in setup.py. Also, don't put the
whole license text into the 'license' tag but rather the short form
'MIT'. The license file is part of the source distribution already and
was added to package_data (so that it ends up somewhere when 'setup.py
install' is invoked).