move extensioneasyblock module into framework (from easyblocks.generic)
fix use of self.builddir, get rid of RPackage specific class variables, initialize self.ext_dir
define self.builddir and self.installdir
prepare toolchain for extensions as well
prepare toolchain also for extensions
return to build dir for building/installing each extension, add debug info
fix typo
move comments into class docstring
fix unit tests
Merge pull request #423 from boegel/extensioneasyblock

move extensioneasyblock module into framework (from easyblocks.generic)