Move tests to root dir

In essence, tests are not an importable submodule anymore but an
independent piece of code that won't be installed in a user's
site-packages directory.
Enhance setup.py

Use trove classifiers instead of keywords. Use 'python' (not
'python3') in the she-bang line to let distributions decide. Use
pkg_resources to load install_requires from requirements.txt. This way
there's only one place to specify dependencies. Since this and
install_requires depend on setuptools, use find_packages rather than
explictly listing Python modules. Fix URL typo.
Add test-requirements.txt

The central place for all testing requirements. And use it everywhere.
Fix all PEP-8 / flake8 code issues

Drop testscope because it's empty.
Name all tests consistently

Let all of them start with 'test_'. And move __main__.py into
__init__.py.
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 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'.
Drop '__main__' from tests

Direct test invocation doesn't work reliably across all environments.
Using 'nosetests $FILE' is much more efficient.
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).
Merge pull request #32 from saschpe/master-stuff

Master stuff