Cleanup, consolidate and propose minor version bump

[moreati]

Sorry it's all at once, I'm still learning GitHub's UI. If this is too much just reject it and I'll figure out how to break it into smaller chunks.

This pull request

• Removes support for Python prior to 2.6
• Removes support for OS X prior to 10.6 (Snow Leopard), including #ifdefs for TIGER
• Proposes 1.7.0 as the next pyscard release
• Makes setup.py the single source of truth for pyscard's version
• Moves the Changelog, TODO and ACKS into the project root
• Deletes the duplicate README and LICENCE in smartcard/
• Adds smartcard.pyro to distributed packages
• Switches to setuptools for build/packaging
• Adds initial support for building pyscard on Appveyor and Travis
• Tightens try/except blocks to avoid catching e.g. SystemExit, SyntaxError
• Adds initial pylint configuration
• Fixes several major errors and warnings found with pylint
• Reformats the supported methods/attributes docstrings in pyscard.i as tables

[LudovicRousseau]

Woua! I will cherry-pick and reorganise the patches.

[LudovicRousseau]

I rebased your patches above master and committed all of them except 2:

• https://github.com/moreati/pyscard/commit/e1bba4b5cc6c700dc52f15078b559eb49df161ba
• https://github.com/moreati/pyscard/commit/370427c985a51cf26c7750745dfd15af2b0053fb

These 2 patches are too big and mix different unrelated modifications. They will also conflict with the python3 branch so they will need to be reworked. I propose to postpone these 2 patches for now.

[LudovicRousseau]

Most of the patches applied.