2014-04-22  Gerrit Holl  <gerrit.holl@utoronto.ca>:

	* pyatmlab-0-0-23

	* pyatmlab/collocations.py(CollocatedDataset.collocate):

	- Fix bug causing collocations to be missed if in the last time or
	latitude bin
	- Make sure there are always at least two bins or binning will be
	problematic

	* pyatmlab/constants.py:

	- Added R, M_d, M_w

	* pyatmlab/datasets.py(TansoFTS):

	- More accurate pressure-to-elevation conversion

	* pyatmlab/local/datasets.py:

	- Fix TANSO path

	* pyatmlab/physics.py:

	- Add more accurate p2z-conversion, mostly stolen from atmlab

	* pyatmlab/tools.py:

	- For the validator, allow multiple validations