updated code to conform to coding guidelines (mostly whitespace); changed password field to type 'password'

git-svn-id: http://gsoc.svn.wordpress.org/2013/codebykat/post-by-email/trunk@2059 f69abe3c-2ee2-4550-9a6d-17bd458115be
Added activation test, fixed a stray comment leftover from boilerplate