Let all fields in edit-account be optional ...

Not an ideal solution. If password is entered, then so should password_confirmation.
We could, of course, get rid of password_confirmation
Leave password related validations to Devise's validatable model ...

Reset min. password length requirement to 6
Merge remote-tracking branch 'upstream/master'

Conflicts:
	app/models/account.rb
 removed some redundant files
Don't mutate the original string in mangle_unmangle

Work with a copy instead
Tweaks to receiveScan + some debugging info added in distribue_scans

In this commit, issuing Savon request in simulation mode. If everything
looks good, then it will be removed
Temporarily, run distribute_scans in debug mode
Getting out of the debug mode
Silly mistake while updating n_assigned attribute of examiners
Merge remote-tracking branch 'heroku/master'
[correction] Path to scan preview