[RHO] Initial commit of RHO algorithm for rapid homography estimation.

Implements the RHO algorithm as presented in

Paper: Bilaniuk, Olexa, Hamid Bazargani, and Robert Laganiere. "Fast
Target Recognition on Mobile Devices: Revisiting Gaussian Elimi[RHO]
Initial commit of RHO algorithm for rapid homography estimation.
nation for the Estimation of Planar Homographies." In Computer Vision
and Pattern Recognition Workshops (CVPRW), 2014 IEEE Conference on, pp.
119-125. IEEE, 2014.

- Complete, heavily documented reference C implementation, as well as
temporarily disabled
 dirty SSE2 port.
- Enabled tests for RHO in test_homography; Currently these fail
presumably due to too-stringent accuracy requirements.
- Refinement and final refinement are not yet functional; Do not pass
their corresponding flags to RHO.

Author: Olexa Bilaniuk
Author: Hamid Bazargani
Author: Robert Laganière