update script name
keep log callback active throughput tor_init()
handle openssl preload and locking mechanisms from tor plug-in

special optimizations for openssl are plugin-specific; while skipping
encryption works for Tor, it might not work for other plug-ins.
shadow-plugin-tor now has more control over how the libraries it
depends on behave.

the minimal tor example works, with and without worker threads.

refs shadow/shadow#211
ensure openssl init and cleanup is locked and happens only once

refs shadow/shadow#211
Merge branch 'master' of github.com:shadow/shadow-plugin-tor