Added project admin entity with remixable flag - close Zeega/Zeega-Issues#983
Added 'remixable' flag to projects - closes Zeega/Zeega-Issues#892
Added redirect to remix after registration
Added link for registration to the login page
update login page copy
Disabled remix for non-remixable projects
Updated editor, players
Added remixable to API response
Merge remote-tracking branch 'origin/remix-flag' into staging
Fixed email validation
Merge remote-tracking branch 'origin/social-email-fix' into staging
Added remixable flag to remixed projects - closes Zeega/Zeega-Issues#1018
Updated editor
Updated player
Added set remixable flag
Added layer delete method - closes Zeega/Zeega-Issues#1011
Merge remote-tracking branch 'origin/delete-fix' into staging
Fixed remixable flag
Removed 'remixable' default
editor, web player updates to support remix