search: add syntax highlighting, line numbers and line context to file content search results

version: bumped version from 4.0.2 to 4.1.0

login: Bring recaptcha back to work. - Missed some template context variables needed for recaptcha to work. - Now reuse the register view in register_post when rendering the form with errors.

login: Fix error when getting remote IP address during registration. - Missed a call to `self.ip_addr` during migration to pyramid.

license: Add license header to new files.

event: Fire event when user sucessfully registered.

event: Add UserRegistered event class.

pytest: Fix the user login function. - Pyramid doesn't expose the session as pylons does it as `response.session` - Therefore we have to look it up in the environ.

pytest: Use hardcoded login URLs in tests. - It's not so easy to use pyramids URL generation methods from within the tests. - Therfore we hardcode the URLs.

pytest: Remove oauth related tests.