git: include OGDF as a submodule ; cmake: force boost version to be at least 1.55 (issue#8) ; ui_text: remove useless local variables ; rst: update compilation instructions ; pkg: re-add LICENSE.rtf since wix is unable to handle utf-8 text file...
Merge branch 'dev' of https://github.com/wisk/medusa into wisk-dev

Conflicts:
	CMakeLists.txt
	README.rst
Merge branch 'wisk-dev' into dev