Added support for fetching individual posts. Improved use of yargs, --help now available. Refactored main app flow.

src/cli.js

@@ -0,0 +1,26 @@
+'use strict';
+
+const config = require('config');
+const yargs = require('yargs');
+
+module.exports = yargs.option('users', {
+    alias: 'user',
+    describe: 'Reddit usernames to fetch posts from',
+    type: 'array'
+}).option('posts', {
+    alias: 'post',
+    describe: 'Reddit post IDs to fetch',
+    type: 'array'
+}).option('limit', {
+    describe: 'Maximum amount of posts to fetch after filtering out ignored, cross- and reposts',
+    type: 'number',
+    default: config.fetch.limit
+}).option('sort', {
+    describe: 'Property to sort posts by',
+    choices: ['new', 'top', 'hot', 'controversial'],
+    default: config.fetch.sort
+}).option('ignore', {
+    describe: 'Ignore posts with any of these properties',
+    type: 'array',
+    choices: ['pinned', 'stickied', 'hidden', 'spoiler', 'over_18']
+}).argv;