Set empty riverid when one is not supplied for new users.
Tidy up.
Make nav helper more friendly and filterable for plugins and themes.
Proper use of url::site(), clean up.'
Fix datepicker in default theme.

- Don't use mm/dd/yyyy format as this will be parsed inconsistently by PHP's
strtotime() depending on locale settings. Use ISO date format instead.

- Make sure the "This Week" quicklink works even if the week crosses into
  the following month.
Merge pull request #1125 from solarissmoke/filterable-nav

Make nav helper more friendly and filterable for plugins and themes.
Added the interarm theme
Merge branch 'riverid-bug' of git://github.com/solarissmoke/Ushahidi_Web into develop

Conflicts:
	application/models/user.php
incident_time should be double-digit.
Fix twitter test logic.
Don't upsize uploaded images.
Set incident mode when creating Twitter reports.
Remove unused query - it counts towards API usage limits.
Replace deprecated "geo" object with "coordinates" object.

See https://dev.twitter.com/docs/platform-objects/tweets
Fix twitter test logic.
Merge pull request #1131 from solarissmoke/bug-twitter-test

Twitter "test settings" always reports an error
Merge pull request #1130 from solarissmoke/bug-report-time

Default report time for web submissions is almost always wrong
Merge branch 'develop' of https://github.com/ushahidi/Ushahidi_Web into develop
Replace unnecessary exception handling during duplicate key check with an INSERT IGNORE statement.
Merge pull request #1133 from solarissmoke/bug-twitter-incident-mode

Twitter scheduler bugs