fixed EDU-260 Course description edit field wrong behavior
fixed ipython notebook cell resize.

Now we use vertical flow layout instead of grid bag layout. Editable cells are self contained so we have invisible prompt labels in them.
Merge remote-tracking branch 'origin/master'
Merge remote-tracking branch 'origin/master'
moved classes to separate package
do not sign extend byte
replaced task window with answer placeholder in some string literals
renamed task windows to answer placeholders for python code
recompile classes with potentially ambiguous method calls when vararg method is added
fixed bug with empty task files, improved navigation to task
Merge remote-tracking branch 'origin/master'
removed vendor
Fix spaces in paths bug (PY-14246).
fix matplotlib in console in windows
Merge remote-tracking branch 'origin/master'
Memory leak in UndoRedoStacksHolder  (IDEA-131506)
don't hold psi in local search scope of SSBasedInspection
refactoring in pydev console
Merge branch origin/master
util: TreeTraverser/FluentIterator from Guava; uiTraverser() and the end of OrphanGuardian