added percentage to Qty and UOM

Little bit hacky to deal with multiplying and dividing
 by scalars. I think it's still easy to read.
Merge pull request #4 from og3b/master

added percentage to Qty and UOM
Move core module src and tests directories
Add maths module
Add daterange module
Created quantity module from code in 'core'

Changed package
Minor changes required for scalatest 2.2
Added curve module

This breaks quantity tests - due to the addition of Percentage
Will fix these later
Added eventstore
CalendarStore added

this compiles but tests won't run due to the classpath depending on both
log4j-over-slf4j and slf4j-log4j12
Adding start/stop scripts for merge purposes only

These won't work until we find a way to run the script with
the appropriate classpath
Some maker config
Merged Qty Percentage fixes