Improve rebar.config generationHEADmasterimprove-rebar-config

We now provide the version as a tagged tuple indicating
whether this is a branch, tag or ref. This should help
rebar automatically upgrade dependencies, and remove
an annoying warning when rebar is used.

In order to detect the type of version the dependencies
must be available, therefore the rebar.config target now
depends on the deps target.

To test this the Cowboy package version had to be changed
from 1.0.4 to master. This is a breaking change, but I do
not expect too many people to still use 1.0.4.

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