-------------------------------------------------
version 0.3.1, 2016-12-31
- calc_MO2():			parameter added: "good_data" which allows identified O2 observations to be excluded from analyses
-------------------------------------------------
version 0.3.0, 2016-11-29
- calc_b():			new function: Calculate the metabolic scaling coefficient, b
- calc_MO2():			new function: Calculate metabolic rate
- conv_resp_unit():		new function: Convert units related to respirometry
- import_firesting():		new function: Import data from a FireSting O2 transmitter
- conv_o2():			added support for ug_per_l and ug_per_kg
- flush_o2():			now returns just the missing value(s) rather than the missing value(s) within a list
- flush_water():		now returns just the missing value(s) rather than the missing value(s) within a list
- flush_water():		now gives a meaningful error message when parameters have a length >1 and plot = TRUE
- Q10():			now returns just the missing value(s) rather than the missing value(s) within a list
- scale_MO2():			now returns just the missing value(s) rather than the missing value(s) within a list
- import_presens():		improved efficiency
- import_witrox():		improved efficiency
- predict_pH():			improved efficiency
-------------------------------------------------
version 0.2.0, 2016-10-07
- closed():			new function: Closed respirometry
- import_presens():		new function: Import data from a PreSens O2 transmitter
- import_witrox():		new function: Import data from a Loligo Systems Witrox transmitter
- scale_MO2():			new function: Scale metabolic rate by size
- conv_o2():			added support for mmol_per_l and mmol_per_kg
- flush_o2():			added support for calculating any parameter from the others, not just calculating final O2.
- mean_pH():			returns an NA rather than error when pH = NULL
- co2_*.R():			improved documentation
- flush_water():		improved documentation
-------------------------------------------------
version 0.1.2, 2016-09-02
- guess_TA():			now allows calculations if salinity is <= 5 psu outside the bounds, but with a warning.
- guess_TA():			fixed a bug where an error occurred if any NAs were provided
- predict_pH():			fixed a bug where an error occurred if any NAs were provided
-------------------------------------------------
version 0.1.1, 2016-08-23
- predict_pH():			fixed a bug where a single NA was returned if any NAs were provided
-------------------------------------------------
version 0.1.0, 2016-08-22
- co2_add():			new function
- co2_flush():			new function
- co2_rate():			new function
- conv_NH4():			new function
- conv_o2():			new function
- correct_bubble():		new function
- flush_carb():			new function
- flush_o2():			new function
- flush_water():		new function
- goal_flush_pH():		new function
- guess_TA():			new function
- guess_when():			new function
- max_MO2():			new function
- mean_pH():			new function
- min_flow():			new function
- peri_pump():			new function
- predict_NH4():		new function
- predict_pH():			new function
- Q10():			new function
- RQ():				new function
