move offer photo upload to new offer form
duplicate multiple file  upload
Spaced erb/html and moved code that generates the categories to the top

Would need to use the latest helper method to make it comma seperated.
Associated with - helper method in Person.rb used to generate content
offer photo upload in  edit
Alert Error - fixed

was using the wrong css classes
Some styling to handle the information to the bottom
Requests and offers given some styling

But the credits come from an existing template.. how to style???
Recent Exchanges - brought to present view

There were some style changes ( html tag wise ) in a prev commit. The
`_recent_exchanges.html.erb` file was slightly different from the other
2 - offers and requests.

Instead of editing the file that might be needed by another view, the
code was brought to the local view.

An atempt was made to populate the field using 'Excchanges' but the
values didn't seem to reflect in the location. The view may or may not
be looking well.
mark new offer photo as primary so it will be displayed. closes gh-414
Merge branch 'master' of github.com:ziyan-junaideen/oscurrency into ziyan-junaideen-master
related to gh-256. allow group admin to specify default roles (in particular, point of sale operator) for new members. also fixed recently changed membership_full partial.