Closes #50: Geth docker addition

[0x0elliot]

Draft PR to keep track of changes. Here is the check list:

Broad target:

• Making the following work:

>>> from geth import LiveGethProcess
>>>
>>> geth = LiveGethProcess(docker=True)

Small targets:

• Add Install support (build + download)
• Add BaseGethProcess start support
• Add BaseGethProcess stop support
• Rest of the commands.. (slow and steady, towards a stable feature set) (help needed!)

Progress:

Next goal is making the following work for mainnet

• >>> geth.data_dir
  "~/.ethereum"

• >>> geth.rpc_port
  8545

• >>> geth.ipc_path
  "~/.ethereum/geth.ipc"

• >>> geth.accounts
  ['0xd3cda913deb6f67967b99d67acdfa1712c293601']

• >>> geth.is_alive
  False

• >>> geth.is_running
  False

• >>> geth.is_stopped
  False

• >>> geth.is_alive
  True # indicates that the subprocess hasn't exited

[0x0elliot]

Progress:

[0x0elliot]

stuck here, eh

[0x0elliot]

why is this happening? this is the command being used by the wrapper right now to get accounts but it fails both on execution because of this error @pacrob 🤔

any help is appreciated, though, i will figure this out soon