Basic interfaces and a partial implementation of the Dense Inverse
Search (DIS) optical flow algorithm without variational refinement. Also
added a python benchmarking script that can evaluate different optical
flow algorithms on the MPI Sintel and Middlebury datasets and build
overall comparative charts.

Extensive changes to README.md opencv_contrib file to bring it up to date.

`lenght` --> `length`

structured_light:  python / java bindings

Update 2

Added naive blockmatching algorithm (just to get acquainted with the code base, this algo shouldn't be considered seriously).
Also, added boilerplate for pcaflow.