Merge pull request #20 from Omegaice/master

Corrected CMake file to find new OpenMM CUDA library
Added build matrix for normal and first order perturbation compilation
Added code to install cuda into the development machine
Added update after loading in the cuda repo
Added code to build openmm cuda library
Changed code to install cuda library
Updated travis ci to add doxygen to the install list
Updated travis ci to build against cuda 5.5
Added exports for cuda 5.5
Enabled building the LTMD CUDA platform
Disabled building OpenMM C and Fortran wrappers for Travis-CI