This adds the following status variables:
* wsrep_local_recv_queue_max
* wsrep_local_recv_queue_min
* wsrep_local_send_queue_max
* wsrep_local_send_queue_min

All of these are reset when the status variables are read just like
wsrep_local_recv_queue_avg and wsrep_local_send_queue_avg.
Document the meaning of fc_master_slave
reintroduce DOC for fc_limit that says "For master-slave setups this number can be increased considerably."
spelling fix in code comments
update to lastest 3.x
Remove query_cache=0 documentation

based off https://bugs.launchpad.net/codership-mysql/+bug/1279220 it
seems query_cache enable is possible. Lets show this in the
documentation.
merge doco from 3.x
Update protostack.cpp

After calling push_front() on a std::deque<>, iterators become invalid per the C++ standard ("after push_back() and push_front() all references stays valid, but iterators don't"). 

Using prev_begin after the push_front() call results in undefined behavior. This fix removes the usage of an invalid iterator and makes the intent of the code more clear.
Update protostack.cpp

(fixed whitespace)
merge from 3.x
innodb_flush_log_at_trx_commit=0 based on http://openquery.com.au/blog/innodbflushlogsontrxcommit-galeracluster
add code-block:: ini docs/source/configuration.rst
Merge branch '3.x' of https://github.com/AndreasVerhoeven/galera into AndreasVerhoeven-3.x
Merge branch 'AndreasVerhoeven-3.x' into 3.x
Ref #61 updates to admin guide
refs #74 - fixed compiler error
refs #89 - first version of deb packaging.
refs #89 script to build debs, improved package description, debug symbols
Merge pull request #86 from openquery/innodb_flush_log_at_trx_commit

innodb_flush_log_at_trx_commit=0 based on oq blog
Merge pull request #68 from openquery/query_cache_possible

Remove query_cache=0 from documentation