Updated the OpenNI2 rawlog grabber so that it stores proper focal lengths.
clang: bunch of warnings and 1 error fixed
MRPT is now compatible with Travis-CI.

Travis will compile every commit and pull request automatically from now on,
the results will show up in https://travis-ci.org/jlblancoc/mrpt
Simplification of the root directory.
Removed swig which I believe is not used by anyone (?)
Added travis status image to main page.
COPYING file moved to doc/