Script to inject stuff in a chain

[eternauta1337]

New Feature

As a: developer
I want: to fetch information from aragonPM on an specific environment
So that: I can customize my own environment and reuse existing apps

MVP

aragen fetch <environment> <registry|apps..> should fetch the whole registry or list of apps from aragonPM on the environment and generate a snapshot ready to be replay on different environments.

aragen replay <environment> <snapshot> should replay a snpahot into the environment. Related to dapplion/aragen-replay

Aragen across environments

aragen as a deployer across environments. Related to #95

aragen script env-origin env-destination <registry|apps..> start a script that fetch the whole registry or list of apps from the env-origin and proceed to replay those to the env-destination

[0xGabi]

Related from #34

Now that we have multiple live versions of the core Aragon apps' contracts, it would be nice for aragen to also deploy older versions in case someone needed to use an older version than latest.