Use actual image property to set the img src

* This is due to change in the structure of the payload returned
by the SwiftRiver REST API
Merge branch 'buckets-ui-dev' into integration-dev
Merge branch 'integration-dev' of github.com:ushahidi/SwiftRiver into integration-dev
Search filter integration

* Integrated the search filter modal into the river and bucket
views. Multiple keywords can be selected but only a single
date filter item can be selected.
Datepicker for the search filter

* Included glDatePicker for selecting dates in the search
filter modal
Replace date picker UI widget

* Replaced the glDatePicker with boostrap-datepicker;
http://www.eyecon.ro/bootstrap-datepicker/

* Closes #319
Merge branch 'integration-dev' of github.com:ushahidi/SwiftRiver into integration-dev
Merge branch 'integration-dev' into buckets-ui-dev
Improve messaging for empty river/bucket

* Better communication (with illustrations) on what the user
should do when a river/bucket does not have any drops