Correct the output prefix for the Southern Ocean set
Ignore build files.
Add region selector to reduction functions for lat-lon contour plots.

- Introduces the following functions:
  - select_region()
  - reduce_seasonal_region()
  - reduce_seasonal_region_level()
  - calculate_seasonal_climatology()

	modified:   lib/python2.7/site-packages/metrics/computation/reductions.py
	modified:   lib/python2.7/site-packages/metrics/packages/amwg/amwg.py
Delete singleton level axis in select_lev function
Insert region-added functions.

These functions should be called from amwg.py instead of the original functions.
They simply select a region  and then call the original function.
Switch to region-sensitie functions in amwg.py
Add TODOs
Add region functionality to amwg1.py
Move reusable functions towards end together.
Begin simplifying code by replacing copied/similar code blocks with calls to refactored functions