Merge pull request #3 from thackray/master

Observation data download tools etc.
EOF update
Updated timeseries playground notebooks
Added historical MOS/OBS comparison plot to test_KCYS.ipynb
Added Norman station for WxChallenge
optional printing control in concatenate_mos()
added modifications to calibration notebook
added OKC/Will Rogers observations handler
Spliced out the first calibration plot (conditional quantile plots) into its own script