Openbazaar python launcher

new pull request after 1st round of reviews.
Thanks @Renelvon this has the merged changes from your repo.

(@Renelvon I kept that REVERT commit you put there as I'm not sure I understood what was right or wrong about it, I figured it'd be easier to fix here now)
Thanks for the new utility. Now for the real issues:
* I prefer to keep `crypto_util` free of OS-dependent code.
* Correct linking of the OpenSSL library is a configuration issue and should be taken care inside `configure.sh`. You can ask for the `DYLD_LIBRARY_PATH` environment variable just as easily inside a bash script.