ilastik: Updated default git tag.
added missing DEPENDS specs for qt4
Merge pull request #25 from ukoethe/master

added missing DEPENDS specs for qt4
Readme: Updated the extra dependencies required to build ilastik.
All make-based projects: Use $(MAKE) instead of 'make' for all commands, per the standard requirements for nested Makefiles.  See GNU Make docs for $(MAKE) for details.
openssl.cmake: Forbid openssl to build in parallel.  The openssl makefiles are not set up properly for parallel builds.
Readme: Added notes about building Qt on X11
python.cmake: Added an optional cmake cache variable to enable building a debug version of Python.
ilastik.cmake: Update lazyflow submodules when pulling from git.
Merge commit '38cd0e98768fd2d3387291dcc637ea403b3d3b19' into fix/OSX10.9