always set a content length header
Merge pull request #78 from dudeman/master

always set a content length header
sending content-length always in case of a POST request
Fixing conflicts in request.js
finished refactoring assertions and adding missing tests
added .init command (alias for url) and improved exception handling
added .init command (alias for url) and improved exception handling
removed Selenium Java stacktraces from the error log output
fixed loading and running of custom assertions