allow initialization for host:port and determine protocol automatically

[rabbah]

rather than init the api like this:

var ow = openwhisk({api: 'https://openwhisk.ng.bluemix.net/api/v1/', api_key: '...', namespace: 'default_namespace'});

I'd like to suggest a little bit of convenience:

var ow = openwhisk({apihost: 'openwhisk.ng.bluemix.net', api_key: '...', namespace: 'default_namespace'});

where apihost allows one to just provide either the host or host:port.
this can be split to determine protocol as in

var edgeHostParts = apihost.split(':');
var protocol = (edgeHostParts.length >= 2  &&  edgeHostParts[1] == '443') ? 'https' : 'http';
api = protocol + '://' + apihost + '/api/v1/';

[jthomas]

I've added this functionality as per the use case above.