Update to support ActiveSupport from Rails5.

• Minor change to AEMO::NMI::NMI_ALLOCATIONS for a 'State' to be an instance of AEMO::Region

• Added AEMO::Market::Node to deal with Region v Node differences

• Rubocop lint bugfix (AEMO::NEM12.parse_nem12 not breaking up rows correctly)
• Timecop added to deal with RSpec failures for unpublished TNI Data
• FY17 Marginal Loss Factors added from http://www.aemo.com.au/Electricity/Market-Operations/Loss-Factors-and-Regional-Boundaries/Distribution-Loss-Factors-for-the-2016_17-Financial-Year

New feature:

AEMO::NMI#current_annual_load