changed update interval from mins to secs

Changed update interval from minutes to seconds for more user control. -
Allow intervals of 15-30 seconds for fast changing temperatures.
Created new program for multiple sensor onewire bus discovery

new program added for dynamic scanning of onewire bus and automatic
detection of up to 20 sensors (easily changeable) arduino program is
well on it's way to working but still has some bugs and incomplete bits.
minor changes for structural derps

minor changes for structural derps - compiles if
rfPayload[3].onewireTemp[i] = temp1 * 10;  is commented out - can anyone
help with this?
added documentation

added documentation about new multiple  onewire sensor program to the
readme file.
semi working - sensors read out, but bad radio

Quashed compile bug and redid some documentation, but radio does not
transmit proper values - it probably can't handle the array in the
typedef struct. will have to fix that. the sensors scan fine and write
correctly to the array (varified by serial output) - also, the power
saving delay has the ability to corrupt serial transmissions. changing
these to regular delays fixes this. - getting there!
added defined array size and cleaned up some code

Defined the array size with max number of sensors and cleaned up power
saving delay code. Also improved documentation throughout the program.
Finished program

The program is finished, tested, and working. I have tested this for
several hours with no problems and returned all configuration parameters
to defaults. This code is ready for review and merge into master.
Fixed a continuing typo

Fixed a continuing typo that limits the amount of sensors to 70 instead
of 60.
Formatting for merge

comments formatted for easier reading and readme file updated. program
function not affected and has been running fine since the last commit
through several power cycles. I would call it stable
Merge pull request #4 from Teslafly/master

Added EmonTH sketch with automatic onewire bus scanning up to 60 sensors