Update build scripts, add Podspec and Travis-CI support

You may need to change some of the URLs for the Travis-CI / Cocoapods support from my fork to yours. Let me know if you have any questions about setting up Travis-CI or the Cocoapods integration. Addresses issues #1, #2, and #3.

* Removed `CPAProxyDependencies` from source control
* Added Travis-CI support
* Added Cocoapods support
* Updated build scripts to OpenSSL 1.0.1i, libevent 2.0.21-stable, and Tor 0.2.5.8-rc

Cheers!