disambiguate this.api_key and fix for string-based instantiation

lib/block_io.js

@@ -18,10 +18,11 @@ function BlockIo (config, pin, version, options) {
 
   if (typeof(config) === 'string') {
 
-    this.key = config;
+    this.api_key = config;
     this.version = version || BlockIo.DEFAULT_VERSION;
     this.server = BlockIo.DEFAULT_SERVER;
     this.port = BlockIo.DEFAULT_PORT;
+    this.keys = {}; // we will store keys for use in between calls here
 
     if (pin) {
       this.pin = pin;
@@ -30,7 +31,7 @@ function BlockIo (config, pin, version, options) {
     if (options && typeof(options) == 'object') this._cloneOptions(options);
 
   } else if (config && typeof(config) == 'object') {
-    this.key = config.api_key;
+    this.api_key = config.api_key;
     this.version = config.version || BlockIo.DEFAULT_VERSION;
     this.server = config.server || BlockIo.DEFAULT_SERVER;
     this.port = config.port || BlockIo.DEFAULT_PORT;
@@ -439,7 +440,7 @@ BlockIo.prototype._constructURL = function (path, query) {
 };
 
 BlockIo.prototype._request = function (path, args, cb) {
-  const url = this._constructURL(path, {api_key: this.key});
+  const url = this._constructURL(path, {api_key: this.api_key});
   const method = BlockIo.decideRequestMethod(args);
 
   const promise = new Promise((f,r) => {

package.json

@@ -9,7 +9,7 @@
     "dogecoin",
     "wallet"
   ],
-  "version": "4.0.1",
+  "version": "4.0.2",
   "preferGlobal": false,
   "homepage": "https://github.com/BlockIo/block_io-nodejs",
   "author": "Patrick Lodder <[email protected]> (https://github.com/patricklodder)",