Require Djblets 0.6.16.
Require Djblets 0.6.16.

Since we'll be moving to a new, incompatible Djblets release before too
long (which will require Django 1.4), we'll need to hard-code the
version that RB 1.6.x is compatible with. Specify that as 0.6.16 for
now.

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