Refactor promises (#33)

* Require github-release-notes.js in the bin file

* Catch promises errors and handle them in a new way

* Update github-api and remove is-online from package.json

* Add hasNetwork check back in

* Update the changelog

* Kill all tasks when catching an error

* Remove extra line in the changelog

* Revert connectivity check

bin/gren.js

@@ -1,13 +1,3 @@
 #!/usr/bin/env node
 
-'use strict';
-
-var GithubReleaseNotes = require('./src/gren');
-var gren = new GithubReleaseNotes();
-var utils = require('./src/utils');
-var action = utils.getBashOptions(process.argv)['action'];
-
-gren.init()
-    .then(function() {
-        return gren[action || 'release']();
-    });
+require('../github-release-notes');

github-release-notes.js

@@ -8,4 +8,9 @@ var action = utils.getBashOptions(process.argv)['action'];
 gren.init()
     .then(function() {
         return gren[action || 'release']();
+    })
+    .catch(function(error) {
+        utils.clearTasks(gren);
+
+        console.error(error);
     });

package.json

@@ -35,8 +35,7 @@
     "chalk": "^1.1.3",
     "connectivity": "^1.0.0",
     "es6-promise": "^3.2.1",
-    "github-api": "^2.1.0",
-    "is-online": "^5.1.1",
+    "github-api": "^3.0.0",
     "object-assign": "^4.1.0"
   },
   "devDependencies": {