Added SIGNET=1 to environment of python child script
Added skipdepends & virtualenv build options
Initiated docs for loader.cpp
Added test_excludes(), test_skipdepends()

Confirmed SIGNET=1 in environment
Revised docs (after we introduced loader.h)
Added reference to virtualenv support
Pypi version bump
Added link to new loader docs
docupdate
Finished documentation (initial)
Docupdate
Merge branch 'virtualenv-compatible'