the web3 we are using is old and everything will change with web3 1.0
which is currently in beta for ages.
ethers.js seems to be a bit more lightweight and implements pretty much
the same API so let's give it a try.
By default kredits-contracts gets the networkId from the web3 object.
This causes some random JSON RPC errors when using MetaMask:
https://github.com/MetaMask/metamask-plugin/issues/1538
This set the default networkId to 17 which is our custom private
network. For development purposes the networkId can also be set
dynamically through the config:networkId local storage entry.
If no web3 is provided from the browser we check if a
config:web3ProviderUrl item is set in localstorage.
If yes we connect to that provider otherwise use the default config.
Helpful for working simultanously with different chains and providers.
bumi
