Updated post signup message.
fixed up tests
Add drag-and-drop file targets for uploading USX

Instead of uploading a file, the USX "upload" copies its text into
the textarea on the corresponding form. That way the user can edit
the USX later if desired (not likely), add a title if he/she hadn't
yet added a title (much more likely), and then click "Save".
design: Update jamaican psalms logo.
design: Updated JP landing page text.
Added phone no to footer.
Fix #46: Hide formatting controls on the question page.
design: embedded video intro JP landing page.
design: update impact story image.
design: remove explore link from jp landing page footer.
Merge branch 'master' into live