Removed ompl_demo and ompl_gui subdirectories.

These have been extracted using git filter-branch to their own repos
Will add them back as submodules
added ompl_demo and ompl_gui as submodules

the were originally normal subdirectories in the same location

- www.github.com/moriarty/libsdp_ompl_demo
- www.github.com/moriarty/libsdp_ompl_gui

This allows for them to be used in sdp_ompl_ros as stand alone libraries.
Working towards Issue #51, and #54
Merge pull request #59 from mas-group/lib-submodules

Lib submodules