ENH initial work on command-line arguments

- define and parse
- still needs 1) args -> function calls, 2) RF tests to use new args
ENH: command line -> function calls, version -> 0.1.7

- command line usage working; most but not every option tested
- py.test passes on mac
  - test_comand_line() only tests encrypt + decrypt
- import pyfilesec is ok
Merge branch 'master' of github.com:jeremygray/pyfilesec

* 'master' of github.com:jeremygray/pyfilesec:
  ENH initial work on command-line arguments

Conflicts:
	pyfilesec.py
commit again, merge clean-up