IOPS v1 plugin. Support for completion-oriented I/O

Change-Id: I6f7a44058af2a179b45f26613400bb2a19f0a92d
Reviewed-on: http://review.couchbase.org/26495
Reviewed-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
lcb_create(): do not poison argument on failures

Ruby client was relying that the pointer will remain NULL in case of
lcb_create() failure, and trying to call lcb_destroy() with invalid
memory on GC. I've fixed ruby side to NULL the pointer on failures,
but it is also makes sense not to touch it unless lcb_create() return
LCB_SUCCESS.

Change-Id: I86d1856ee403ef411a0c7e9df93add8a995156f8
Reviewed-on: http://review.couchbase.org/27636
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Script to generate HTML site from man pages

Change-Id: Idd32c541e53185adbc8abcd7a40c68d58440ceb2
Reviewed-on: http://review.couchbase.org/27694
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>