Re: #92 Real time emailing of posts and comments

Added settings in each space for the user to select to have posts
and/or comments sent, plus a checkbox for each thread, to choose to get
new comments in the thread. Added a new queue for the purpose, and a
long running job that processes it.
add fixture system
Fixed email sessions that require TLS (like Gmail), added g.email_debug for output
Added email_debug flag to globals
Merge branch 'issue-92-real-time-email'