Increase connection_pool, configure reaper

When multiple workers attempt to join/communicate at once the pool is being exhausted.
There's also no sense in waiting for 5 seconds since we're on a good connection.
If it can't get one immediately, it should give up. Also configure the pool
reaper in case a thread happens to leak a connection.
Don't include CloudCrowd into Kernel name-space

CloudCrowd's constants such as PROCESSING, FAILED, COMPLETE, etc where
polluting the namespace and leading to confusing when the console was used.

This moves only the relevant classes into the Kernel name-space
for easier querying while leaving everything else defined only
under CloudCrowd.

It's a pretty gnarly hack, but is only used in the console, so... yay?
Make ProcessingJob a belongs_to for easy retrieval
Clear X-Frame-Options for iframe_success action