Shut down trigger if initial mysql connection doesn't work.  Use a
try/catch to display some information about the connection failure
without a traceback.  For other mysql issues, we will leave as is
(dumping the traceback) because they would represent coding or
transient issues, and we should present as much information as we
have.
Make patches agains 'develop' branch rather than 'master'
Merge pull request #65 from mvh/mysql

fixes #60