Updated charm helpers to have apt retry logic.
[tribaal,r=gnuoy] This branch updates charm-helpers to the latest version to let the charm make use of the recently introduced retry logic around apt methods (the charm will wait and retry should it fail to acquire the apt lock).
* Added a "sync" target that will sync the charm-helpers automagically.
* The bin/ directory was added to .bzrignore.
[tribaal,r=gnuoy] Add a more clever "sync" target, that will automagically update charmhelpers