add simple automation

added automation based on smoker temp vs. target temp.
Update README.md

added '<br>' because of uncooperative GFM. !?#$!&
Update autosmoker.py
added timer

added startup timer at 45 degrees for door (5 min). Also added manual
door position entry on web form (does not override hardware manual mode)
fixed bugs, added options

hardened servoreader, added option to turn off 5 min timer, changed
default settings
Merge pull request #19 from mattstarr/automation

Automation