Update README
Update README

* Remove 'C89' list item - we're a mix of C89 and C++ now
* Add some additional projects, and add a section for 'community
  projects'

Change-Id: Ie0fe4956d90755c81932c0c7de8d5836024fb23c
Reviewed-on: http://review.couchbase.org/62955
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>

couchbase/libcouchbase,mody/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,mody/libcouchbase,mody/libcouchbase,kojiromike/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,mody/libcouchbase,kojiromike/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,avsej/libcouchbase,avsej/libcouchbase,kojiromike/libcouchbase,kojiromike/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase