Add show action to the api v1 for problems

This allows a problem id to be passed to the problem api and only
information for that problem will be returned.
Add a problems err and notices in api show action
List users by name on app edit forms.
Whitespace.
Sort users in Ruby so we can be case insensitive.
Merge pull request #704 from elliotcm/sort-users-by-name

Looks good. Thanks for your contribution.
Adding file not found handling

If there is no problem for the requested id the api will now correctly
return a 404 status.
Limit the show action to just the problem

This commit backs out the nesting of the error and notices as this would
be better placed in an error or notices route.
Merge pull request #693 from CallumD/add_notices_to_show_action

Add notices to show action
Fallback to ENV['MONGO_URL']

Dokku mongodb plugin compatibility https://github.com/jeffutter/dokku-mongodb-plugin
Merge pull request #710 from glebm/patch-1

Fallback to ENV['MONGO_URL']
Fix regenerate_fingerprints so it remaps all notices to fresh errs
Add new simplistic fingerprint
Begin using custom fingerprint
Remove unnecessary private method
Don't include BacktraceLine#inspect in fingerprint (it makes fingerprints useless)
Finish todos; cleanup defunct problems; improve output.
Merge branch 'regenerate_fingerprints' into custom_fingerprint
Fix output (percentage)
Guard against mongo cursor timeouts while iterating over ginormous collections