Independent Build Process

This commit includes the compilation of the dynamic/static libraries
that compose nupic.core. They are generated by default on
nupic.core/build/release folder, however any user could change its
destination using "cmake -DPROJECT_BUILD_RELEASE_DIR=…" command line.
Thought this option, Travis at nupic repo will compile the static
libraries and put them on /external folder.
Note that neither HtmTest not TestEverything was included, they still
are hybrid and Python test need be removed from them.