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Thomas Scholtes 5c83972401 Use promise interface for commands
This commit changes the interface of the command functions exported by the
files in `lib/commands`. The functions now return a promise and accept a logger
as the first argument. This has several advantages

* The promise style is consistent with the rest of the code.
* It removes a lot of duplicate code.
* The command factory does not need to proxy the logger object.
2014-06-20 21:14:26 +02:00
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2014-06-20 21:14:26 +02:00
2014-06-20 21:14:26 +02:00