Bump aragen to 2.0.0-beta.3 (with production kits)

[izqui]

Bumps aragen to a recently generated version with the current state of aragonOS, apps and kits.

It is the first aragen release which contains the production kits: democracy and multisig.

In order to use, fetch this branch and:

npm install
npm link
aragon devchain --reset # keep it running
aragon ipfs # keep it running

The onboarding in the client should now work for both production kits

After setting a name for a DAO, this name cannot be reused unless after a devchain reset.

[kernelwhisperer]

This will resolve #227, is that correct?
I just tried to create a multisig and I get this:

Error: Could not fetch ABI for template 'multisig'
    at Object.newDAO (index.js:104)

Looks like apm.getLatestVersion(''multisig-kit.aragonpm.eth') is expected to return { contractAddress, abi }

[kernelwhisperer]

Closing in favor of #268