feat(codepen): support for codepen embedding added

Author: ritz078

src/embed.es6

@@ -45,7 +45,8 @@ import Twitter from './modules/twitter.es6';
             align      : 'none',
             lang       : 'en'
         },
-        excludeEmbed : []
+        excludeEmbed : [],
+        codeEmbedHeight : 500
     };
 
     class EmbedJS {

src/modules/code/code.es6

@@ -4,6 +4,7 @@ import Highlight from './highlight.es6';
 import Ideone from './ideone.es6';
 import Plunker from './plunker.es6';
 import JsBin from './jsbin.es6';
+import CodePen from './codepen.es6';
 
 class Code {
 	constructor(input, output, options, embeds) {
@@ -21,6 +22,7 @@ class Code {
 			embeds = utils.ifEmbed(this.options, 'ideone') ? await (new Ideone(this.input, this.options, embeds).process()) : embeds;
 			embeds = utils.ifEmbed(this.options, 'plunker') ? await (new Plunker(this.input, this.options, embeds).process()) : embeds;
 			embeds = utils.ifEmbed(this.options, 'jsbin') ? await (new JsBin(this.input, this.options, embeds).process()) : embeds;
+			embeds = utils.ifEmbed(this.options, 'codepen') ? await (new CodePen(this.input, this.options, embeds).process()) : embeds;
 
 			return [output, embeds];
 		} catch (error) {

src/modules/code/codepen.es6

@@ -0,0 +1,32 @@
+import utils from '../utils.es6';
+
+class CodePen{
+	constructor(input,options, embeds){
+		this.input = input;
+		this.options = options;
+		this.embeds = embeds;
+		this.regex = /http:\/\/codepen.io\/([A-Za-z0-9_]+)\/pen\/([A-Za-z0-9_]+)/gi;
+	}
+
+	template(id){
+		let template =
+		`<div class="ejs-embed ejs-codepen">
+		<iframe scrolling="no" height="${this.options.codeEmbedHeight}" src="${id.replace(/\/pen\//, '/embed/')}/?height=${this.options.codeEmbedHeight}"></iframe>'
+		</div>`;
+		return template;
+	}
+
+	process(){
+		let match;
+		while((match = utils.matches(this.regex, this.input)) !== null){
+			let text = this.template(match[0]);
+			this.embeds.push({
+				text:text,
+				index:match.index
+			})
+		}
+		return this.embeds;
+	}
+}
+
+module.exports = CodePen;