dropdown for site selector

added a dropdown as a select field if there are
more than one sites created. The dropdown will
automatically link to the other site.
update gemspec
Merge branch 'master' of github.com:melvinsembrano/cms-fortress
Merge branch 'dropdown_for_site_selection' of github.com:sumcumo/cms-fortress into sumcumo-dropdown_for_site_selection
updated the site selector
Merge branch 'sumcumo-dropdown_for_site_selection'