New features for graphing temp, cpu and memory, and switch hardware platforms

Added cpu, memfree and temp to the graphs available
added hardware platform to allow for different OID's 
updated install doc and sample config file
added new table to db for alt graphs

To do:
still needs a little tweaking on the gui, add new graph types to the header for graphtype
fix graph sizes and descriptions
maybe change the area color from yellow to green
need to do math on the kilobits so it graphs mem properly