Fixes #2213 - improves compatibility when jquery-ui stylesheet is included
Merge pull request #2646 from asgeo1/jquery-ui-stylesheet-compatibility

Fixes #2213 - improves compatibility when jquery-ui stylesheet is included
Fixes #2650 by specifying updated dependencies, preferring gemspec rather than Gemfile.
Fixed positioning of close link on dashboard welcome message.
Added a little hack for WYMeditor image dialog paging.

Fixes #2639