support for OpenCV grey images
updated interop/opencv/core.hpp for grey images
Add benchmarks for partitioning algorithms
Merge pull request #155 from Mageswaran1989/image_format-support-grey-images

image_format-support-grey-images
Merge pull request #157 from roshanr95/partitioning_algorithms

Add benchmarks for partitioning algorithms
Enable OpenCV on Travis-CI
Change function signature of search algorithms to match STL versions
Add benchmarks for search algorithms
Merge pull request #158 from roshanr95/search-algorithms

Search algorithms
Add benchmarks for permutation algorithms
Merge pull request #160 from roshanr95/permutation-algorithms

Add benchmarks for permutation algorithms
Merge pull request #52 from kylelutz/develop

Update Develop