add a sequential option to the reload command for #646
add basic test
Modify config.py for combining the same condition code
move list to tuple
Move check_flapping to default True group
Delete pids that don't have recent stats
Merge pull request #697 from dongweiming/modify_config

Modify config.py for combining the same condition code
Added circus-top CLI argument process-timeout
Fix typo in circusweb.rst
Merge pull request #707 from bbinet/master

Fix typo in circusweb.rst
Temporary travis fix not needed anymore
validPid renamed to valid_pid
Create commands.rst, remove _HEADER and add comment about circus_ext.py

Take content from circus_ext.py
Refactor in commands-intro.rst
Merge pull request #710 from eikonomega/commands_documentation_update

Commands documentation update
Make sure we don't add extra EOLs - fixes #711
no concurrent execution during arbiter restart

An explicit test is needed because the restart()
command is a kind of stop() command. The start after
the stop is made (externally) by circusd for plenty of reasons.

So the restart() command is over before the arbiter is really restarted.
So the classic synchronized decorator is released too early.

see #714
Fix typo in decr command docstring
fix the add command to respect the rlimit_* settings

- add special logic for validation rlimit_* keys when used from the
add command that matches the way rimit_* options are processed via
the conf file
- added a test for the rlimit_* validations
allow you to override the virtualenv command to one in your environment