STYLE: Make use of angled brackets vs. quotes for #includes consistent

Headers within TubeTK are placed in quotes. Headers from external libraries
are placed in angled brackets.

Change-Id: Iddc8c0176edabb25d2840941c2676b8e89898553
ENH: Make naming conventions for optimizers consistent

Change-Id: Ie05f3b4809f38429723cf7034f2567440f5dbc85