Add configuration file support

[frank-dspeed]

i want to create a PR for a configuration file please lets discuss what you would prefer for name and that i will simply add all cli options to it this way done-serve gets a middelware like discussed in other issues.

[matthewp]

What would the config file do?

[frank-dspeed]

@matthewp it would handle all manual passed cli options
based on NODE_ENV

-p, --port
-r, --proxy
-t, --proxy-to
--proxy-no-cert-check
-d, --develop
-s, --static
--error-page
--timeout
--debug
--key
--cert

it could be called .donejs
and include donejs related stuff. alternativ done-serve package json property ??

[matthewp]

That should be the same as doing:

const serve = require("done-serve");

serve({
  port: 8081,
  key: ...
});

Maybe we should just document that it can be used like this?

[frank-dspeed]

@matthewp i am for a configuration option that get saved with the project so we can avoid the npm scripts for that so that running done-serve in a project directory simply works with what ever NODE_ENV is set we also should enable a new random port option to run more then one done-serve instance at the same time i am at present preparing "steal-livereload" middleware but it takes a bit longer because i striped out all relevant parts of steal-tools to don't have it as dependency and clean rewrite the stream stuff.