Delete Functionality

Added preliminary delete funcitonality for user posts. A user can
delete own posts.
Improved Delete Function, corrected post counts.

Before, post counts would reflect total number of posts, not just the
active posts. Now a running total of active posts is kept under
user:id:<user_id>:numposts and is incr and decr when posts are added
and subtracted.
Replacing proprietary words with more generic terms in source code, debugging crash.

Replacing proprietary words with more generic terms in source code,
debugging crash.
Fixing incorrect post counts / site crashes.

Fixing incorrect post counts / site crashes.
repair after merging experimental -> master
- guest user now cannot delete posts