First version with python3 support.

* Moved requirements*.txt files to proper spec definitions in setup.py
 * Added a new fig.compat module to store some compatibility code

fig/cli/docopt_command.py

@@ -1,3 +1,5 @@
+from __future__ import unicode_literals
+from __future__ import absolute_import
 import sys
 
 from inspect import getdoc