Start testrpc with '-i' switch

[area]

If we do this, we can set it to 'solidity-coverage' or something similar, and people can use web3.version.network in their tests to decide if they're running against coverage if they need to execute slightly differently (most likely, varying gas costs / responses to gas used).

EDIT: I know this can already be achieved with a custom testrpc options, but having it by default would be nice.

[cgewecke]

Agreed - this is a great idea. . .we might also document this in the FAQ gas section since it will dramatically simplify adding SC to a suite with lots of gas values above the default transaction limit.