v0.8.9

• We moved Web UI to materializecss.com CSS framework
• We moved from CDN to local assets for Web UI
• We show current state of a job in Web UI (thanks to @michaelachrisco) #16
• We won't write a pidfile unless daemonized (thanks to @thomasfedb) #13
• Fixed rake crono:clean task error
• Fixed issue when jobs scheduled at same time exclude each other #19
• Fixed issue with a daemon crash due to time interval must be positive error