Model tweaks

Hi guys, thanks for developing this nice model. Here are some tweaks. 
Nice chatting with you Jarod :)
'Indexation' is the correct terminology. See:

https://www.ato.gov.au/Rates/HELP-indexation-rates/

And second paragraph of:

http://budget.gov.au/2014-15/content/bp2/html/bp2_expense-09.htm