Add Percents key (%)   and the function to handle it  to the calculator

Enyo-DCO-1.1 Signed-off-by: johnmcconnell@yahoo.com
Formating fix  space/tab mix

fixed my bug in %  *6 dose not become *6 but .06 now

Enyo-DCO-1.1 Signed-off-by: johnmcconnell@yahoo.com
Merge pull request #6 from micro-tech/Fixes

Fixes for code layout and adding %