2.1.0

merge of nginx module changes

• Due:03/Jun/14

• CCBC-210 2013-05-10T17-58 Last Thursday 4:52 AM segfault from lcb_wait and libev
• CCBC-204 2013-04-29T11-18 08/May/13 configuration cache does not work for memcached buckets
• CCBC-181 2013-02-15T10-16 02/Apr/13 enhance observe man page with a more complete example