Extract date format normalization into DateParsing module
Ignore sandi_meter output
Use respond_with
Extract contribution partial and introduce contributions helper

Previously the code to render the contribution details differed and so
it couldn't be shared, but the contributions helper introduces functions
that allow the same template to be shared by by the batch contributions
view and the regular contributions view.
Update bootstrap-sass and glyphicon class names in datepicker
Initial attempt at export to CSV basic functionality
Update Ruby, Rails and all gems to the latest versions
Specify username attribute name for sorcery

For some reason it doesn't assume that the username attribute name is
username anymore.  :/
Fix failing spec

Something must have changed in the gem upgrades that caused this to
start failing. I'm not entirely sure why it was working in the first
place?