Updates cla_classifier_diff since it didn't get the recordNum update.
Adds unit tests for the diff classifier.
Merge branch 'master' of github.com:numenta/nupic
Merge pull request #104 from scottpurdy/master

Model.load and CLAClassifierDiff tests
update boost to 1.52.0

need more recent version for compiler fixes/warnings, fixes, portability and other improvements
as of today, 1.53.0 is the latest version, but 1.52 is latest that builds without any modifications to the code.
Changelog can be found here: http://www.boost.org/users/history/
SWIG: update library to 2.0.10

this is latest version, changelog can be seen here:
http://www.swig.org/release.html
SWIG: make MacOS and Linux share the swig dir

put it in external/common/
SWIG: update swiglib path

to external/common/share/swig
swig: update the Linux swig executable, !Mac needs update too

downloaded and built swig (2.0.10) on local machine and distribute the executable
swig file. Please build one for Mac and add it too!
remove libstdc++ license

we no longer link statically to libstdc++
see https://github.com/numenta/nupic/wiki/Configuration-and-Build-System
and NPC-59