Include the "community" page in the top-level docs as well as in each build.
Clean up error handling, we have to translate Helium errors into WiredTiger
errors before we return.

Rework the dump routine, it had random garbage left over from old debugging
runs.
Add basic support for Helium statistics/debugging; this should really get
hooked into WiredTiger statistics, but that's a project for another day.
Fix some GCC 4.8 "maybe-uninitialized" warnings.
Add a place for a final sanity check, make sure that value min/max and
key min/max aren't misconfigured (if you set {key,value}_min, but not
the corresponding max value, you could end up with impossible key/value
sizes.
If there are many identical overflow values on the page, checking for
an overflow value to reuse goes quadratic; instead of returning the
first matching item, move through the list of matching items at a high
skiplist level, dropping down only when we find a matching value that's
not in-use.
whitespace, update spelling list.
Add support for zlib compression
Improve comments in the zlib extension
Fix some nits in the zlib compress implementation.
Remove some debug code from zlib.
Merge pull request #855 from wiredtiger/zlib

Add support for zlib compression
Merge branch 'develop' into merge-efficiency