osx: allow a flush on the python env and selection of the system default
     python executable. Having lldb itself use python can be quite troublesome.
Merge pull request #1312 from monkeyiq/2014apr/issues/1293v1

osx: allow a flush on the python env and selection of the system default
osx: some smaller build scripts, some documentation on the build environment and
     procedure.
Merge pull request #1313 from monkeyiq/2014apr/issues/1256scriptupdate

osx: some smaller build scripts, some documentation on the build environment and procedure.
osx: add archive and upload script
Merge pull request #1316 from monkeyiq/2014apr/issues/1256scriptupdate2

osx: add archive and upload script
gc: on osx fontforge-config.h *must* be included before ffglib.h.
    At any case, since calloc() is being tweaked then the fontforge-config.h
    doesn't help to be explicitly the first include file just to be sure.
Merge pull request #1317 from monkeyiq/2014apr/gcupdate1

gc: on osx fontforge-config.h *must* be included before ffglib.h.
Update README w links to developer documentation
Add fontforge-internal-collab-server to GITIGNOREFILES, as git.mk doesn't know about internal_bin_PROGRAMS