Add ct-dns-server to .gitignore.
Disable server/ct-dns-server-test.py for now.
The tests in "cpp" depend on "python".

This is because of the Python protocol buffer files.
Add new dependencies on ldns to Travis.
Send Travis notifications to the mailing list.
Expand the log list printing utility to generate code for Chromium.
Reviewed: https://codereview.appspot.com/103340045/
Modifying print_log_list to generate code in a general fashion rather than Chromium-specific.
Python: Extracting a proper interface for the scanner, so tools that
use the scanner can be written.
The interface is a bit preliminary and the code is not free from print
statements. Refinements are welcome.
Update AUTHORS and CONTRIBUTORS files.