Add test runner python module

[anvacaru]

Writing tests

• First, the module pyiele needs to be imported.
• The default values for the client port, passphrase, spending-key, gas-limit and other parameters are defined in the config.py file.
• A contract can be deployed using deploy_contract(walletId, sender, bytecode).
• A contract function can be called using run_function(f_name, f_args, walletId, sender, to).
• Any rpc call can be made using send(rpc).
• RPC calls are defined in rpc.py.

Running tests

>$ python3 test_erc20.sol

[ehildenb]

@anvacaru and @gtrepta can we add some tests of this functionality as well? Just a single Solidity file -> generated report files, and diff the files should be enough.

Or we can just make sure the tool runs smoothly, and not record the output, as an initial test. But it probably would be better to start with too strong of testing (with the output files) and weaken it as it gets annoying.