pm2: add page (#1306)

* pm2: add page

* Make Travis happy

* Added pm2 restart

* Simplifying examples

* Fixed typo

pages/common/pm2.md

@@ -0,0 +1,24 @@
+# pm2
+
+> Process manager for Node.js.
+> Used for log management, monitoring and configuring processes.
+
+- Start a process with a name that can be used for later operations:
+
+`pm2 start {{app.js}} --name {{myapp}}`
+
+- List processes:
+
+`pm2 list`
+
+- Monitor all processes:
+
+`pm2 monit`
+
+- Stop process:
+
+`pm2 stop {{myapp}}`
+
+- Restart process:
+
+`pm2 restart {{myapp}}`