Make SP destructor virtual.
Make FlatSpatialPooler destructor virtual.
Deletion of old build system

Removed buildinfo.py and makefile.ami files.
Merge pull request #30 from DavidRagazzi/master

Deletion of old build system
Merge pull request #22 from scottpurdy/master

Make SP destructor virtual #23
Merge branch 'master' of git://github.com/numenta/nupic.core into nupic-core-silence-warnings