Change default and example Zanata URLs to be correct.

The example URLs did not include "/zanata" at the end, so they would not
work for the main instance if users left them as-is. Better to make it
non-broken by default.
Replace Implements comments with behaviour summaries.

Review feedback indicated that Implements comments were not appropriate
for implementing interfaces from TMGMT, since these are not Drupal
hooks, so they were replaced with brief descriptive summaries of the
function behaviour.
Merge branch '7.x-1.x'