Add bulk API methods for log support
Fixing wrongly placed semicolon that made "_executePhantomJS" global as consequence.
Implement HAR logging API method.
Fix network logging
Improve network activity logging. Add 'browser' type logging.
Move HAR library to vendors. Add proper doc blocks
Remove debug code from HAR library
Fix har.js path
Clear log buffer after each page refresh.
Fix har logging
Making the "third_party/har.js" a bit more resilient to inconsistent data
Making sure we can introduce support to new Log Types easily.

The only thing to modify will be the core "session.js".
The SessionRH will adapt it's behaviour accordingly with this change.
Reformatted "log output format" and renamed "network" to "har" log type
Rewritten "oneShotCallback" logic to better deal with timing/logging.
Fixing minor issue with tracing HTTP requests that error.
Adding Java Tests for the new "/log" support.

This can be considered conclusive to close #55.
Update to Gradle 1.9 (for tests) and Selenium 2.37 (for tests)