Combine our HTTP RPC and Websocket services into a single HTTP server, eliminating the --ws-port flag to swapd and using --swapd-port flag for swapcli.
* Switches to current v2 version of urfave CLI
* Fixes incorrect port values in the help
* Provides defaults directly to urfave for clear `--help` messaging
* `--base-path` flag renamed to `--data-dir`. This matches `monerod`'s' `--data-dir` and almost matches the `geth` flag `--datadir`
* Bootnodes and contract address are provided for stagenet testing
* Bootnodes can be provided individually by repeating the `--bootnodes`/`--bn` flag, or as a comma separated block (original behavior), or even a combination of both. (Makes adding/removing bootnodes a lot easier.)
* More precise error messaging when XMR maker/taker values are off
* Fixes bug in the peer finder where XMR was hardcoded as the provides coin
* `cleanup-test-processes.sh` displays which processes are being killed
* begin refactor of make/take offer
* implement ability to make offer, advertise new offers, lint, etc
* implement personal rpc service
* update readme instructions
* add check that taker of offer provides correct amount
