Consolidate requirements and freeze

[badmutex]

@laszewsk @fugangwang

This consolidates the requirements into requirements-open.txt and requirements.txt. The former are the unbounded requirements that are to be used during development and testing while the latter is pip freeze-generated.

I've tested by installing the sdist and wheel into clean environments and running some cm commands. edit: also: nosetests tests/cm_basic works

A couple other notable changes:

• removal of the circular dependency when installing
• makefile rules for dist and clean no longer require/assume this cloudmesh client is installed as the circular dependency is removed

Incidentally, pip install . now works.

[badmutex]

python setup.py install doesn't work yet though.