the injection pattern for extending charms

[Patrick Hetu]

I've finally done a workable draft with the "configuration injection"
feature.
So know a charm can add builders configuration via a "builder-file"
relation.
Also the charm use charmhelper library now:

lp:~patrick-hetu/charms/precise/buildbot-master/charmhelpers
lp:~patrick-hetu/charms/precise/buildbot-slave/charmhelpers

It still missing some features that the original charm had but those could
be
implemented with subordinates or with relations.

Also, if you like that and since I'm using buildbot a lot I would not mind
maintaining the charm.

Note: Thanks Gavin for your comments, I've included the fixes in my code.

Patrick
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