Independent Build Process

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