Fixing some unit tests.

[#63899240]
Adding methods for easily retrieving infiltration information. Needed to cleanly report out metrics of interest in the "reduce infiltration" measure.

[#59977728]
Start of infiltration metrics implementation. May not get back to this until tomorrow.

[#59977728]
Implemented infiltration getters. Modified ShowRunnerOutput.rb to also list machine-readable attributes.
Only show json file if there are attributes.
Merge pull request #803 from NREL/20140115_ETH_UbuntuUnitTests

20140115 eth ubuntu unit tests