* Update the developer road map document.
* Update the compiling KiCad from source document to reflect recent build
changes.
* Change Cairo library version to 1.8.8 to fix build issues on CentOS 6.
- Create KiCad road map document.
- Add road map to developer's documentation.
- A separate road map build command to CMake so the road map can be built
separately for use in websites.
- Update .bzrignore to ignore road map files generated by Doxygen.