Fix bugs, refactor, implement hidden layers, unit tests

Change Log

Implemented enhancements:

• Multiple hidden layers per controller layer #7
• Vizdom integration and fix cumprod bug #5 #6 (ixaxaar)

Fixed bugs:

• Use shifted cumprods, emulate tensorflow's cumprod with exclusive=True #5
• Vizdom integration and fix cumprod bug \#5 #6 (ixaxaar)

Closed issues:

• Write unit tests #8
• broken links #3

Merged pull requests:

• Test travis build #10 (ixaxaar)
• Implement Hidden layers, small enhancements, cleanups #9 (ixaxaar)