Universal-dapp was originaly factored out of browser-solidity to modularise
the contract interface component. And so is a direct decended of the
code it removes/replaces. Adding a number of features:

- constants are shown by default when appropriate
- all methods show gas execution costs when run
- smoothes the path to interacting with a local node aswell as vm
- allows instanciating contracts from an address
- shows events where supported