[sugar] Additions to CodeReview policy

[Marco Pesenti Gritti]

http://sugarlabs.org/go/DevelopmentTeam/CodeReview#Buildbot

== Buildbot ==

We are running periodic builds of Sugar using [[Buildbot]]. If you break 
the build you are responsible to get it fixed. If you don't the release 
team will take care of it, most likely by reverting your patch. More in 
detail:

* Every change that causes build or check failures should be immediately 
fixed or reverted.
* Every change that causes check warnings should be fixed or reverted 
within 24 hours.

You can use the check command in sugar-jhbuild to execute the same 
checks that [[Buildbot]] is doing.

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Note that the buildbot is not fully clean yet, it will be pretty soon.

Marco