Added 2 more wrapper functions to co2_functions for absorbance ratios
Merge pull request #19 from cwingard/pco2

pCO2 Wrapper Functions.
Fixed variable name conflict in adcp_functions
Merge pull request #20 from cwingard/adcp

ADCP Functions: variable naming conflict
Fixes spike test

The inputs are going to be arrays so the single variable inputs need to be referenced from the first element of the
array instead of raising an error.
Merge pull request #22 from ooici/fixes

Fixes spike test
Removes int
Fixes dataqc_stuckvaluetest