Omeka 2.x compatibility
fixes syntax error that occurs in some environments
Removes support for deprectaed SubjectBrowse plugin
Adds basic support for GuestUser plugin

Note that this plugin currently (apparently) causes some issues with
the mobile-json output context and shouldn’t be used until that’s
figured out.
Support for internationalization

Special thanks to @jeau for starting the process and submitting many of
these updates.
Formatting
CSS: Fixes IE Metro snap view
fixes via @greyson
Removes deprecated settings() function and goes back to using option().
Thanks to @jeau for catching.
Internationalization improvements

more via @jeau