remove unused imports in python build_system files
tp review: use anonymouse variable in for loops

use _ in for loops where the value is not used
remove pointer

NB was reporting error, removing the pointer
was: *tps.values()
now: tps.values()
examples/prediction review

mostly unused imports
review examples/bindings

unused imports, anonymouse vars
sets.Set is deprecated, use built-in set

as for python 2.6, sets.Set is replaced by builtin set()
experiments/opf reviewed

remove unused imports,
keep the NUPIC specific, even if unused (commented out code)
PIL removal

remove obsolete PIL/Imaging/Python Image Library,
it was used for image recognition, is now unsupported
and obsolete.

Used eg in people-tracking-demo
PIL add notice to demo using PIL

maybe it got broken, well, it's broken anyway
remove libpng

was used as dependency of PIL (obsoleted too)
mention PIL in requirements.txt for pip

Conflicts:
	external/common/requirements.txt
Merge pull request #178 from breznak/netbeans-code-advices

Netbeans code advices for C++ and Python
Revert "use python2,"

This reverts commit 0b23bb74fb9cc041befa8fc5ee48a79077d76e05.
Append to PATH rather than setting it to use old _PATH that may be outdated.
Merge pull request #184 from scottpurdy/fix-build

Fix build
Add python*-config approach to ldflags that works for OS X.
First attempt to enable travis uploads.
Consistently accessing env vars
Merge remote-tracking branch 'upstream/master' into publish-artifacts
Removing all the examples from the build.