Update README.md

Updated branching notes
iocchiller: renamed ioc and updated st.cmd
RELEASE: cleaned up and added devIocStats
Merge branch 'master' of https://github.com/wmoore28/epics into chiller
chillerApp: added devIocStats
chillerApp: added medm symlink to work with medm Makefile
iocchiller: added devIocStats
Merge branch 'chiller'
Added user's manual
Added proper range settings and auto-range option
Added devIocStats
Merge branch 'keithley-mod'
Fixed merge conflict for RELEASE