Improvements

Stop giving out bad advice in the help output of create-job
and update-job, with respect to propery schedule syntax.
Better error messaging in filepath walker when the fs plugin
encounters an error or missing stat info.
Credentials (as defined by plugins) are now redacted in task
output, based on the rights of the viewer.
The xtrabackup plugin now supports the mysql_socket option,
for specifying the absolute path to the MySQL socket.

Bug Fixes

Properly set the job name and notes (summary) from the web ui
wizard, instead of ignoring what the user provided. Fixes #387.
The webdav plugin no longer panics if you omit the https://
or http:// URL scheme from your DAV server URL. Instead, it
assumes HTTPS and keeps on truckin'. Other URL parse errors are
properly handled now as well.
Handle people who don't set up their Github profiles properly,
and are missing display names. The Github API returns these as
nil string pointers, instead of pointers to the empty string.