Added Coal Employment folder

Created 20150817-coal-employment-BLS directory and added xls, csv and
README files

20150817-coal-employment-BLS/README.md

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+# U.S. Coal Employment, 2001 to 2014
+This repository contains the number of coal mineres employed in the top ten U.S. coal producing states from 2001 to 2014.
+
+## What's in this repository?
+
+This repository includes the data used for the graphics in the Inside Energy story, ["Wyoming Town Built On Coal Contemplates Its Future"](http://insideenergy.org/2015/08/17/wyoming-town-built-on-coal-contemplates-its-future/).
+
+## Data dictionary
+
+The data files *coal_employment_2001_2014.csv* and *coal_employment_2001_2014.xlsx* include the number of workers employed in the coal industry annually for the top ten coal producing states (Illinois, Indiana, Kentucky, Montana, North Dakota, Ohio, Pennsylvania, Texas, West Virginia, Wyoming).
+
+## Data Sources and Notes
+
+The original source of the general coal data is the Bureau of Labor Statistics' Quarterly Census of Employment and Wages, which is accessed [here](http://www.bls.gov/data/#employment). 
+
+Inside Energy queried using the NAICS code 2121 (coal mining). 
+
+Note that 2014 data is preliminary. Data was not available for all states and all years, due to privacy concerns. In our graphic, we added a dotted line for Illinois when the data was not available. In the data tables, we used "--" to indicate unavailable data. Note that this does not mean no coal workers were employed in those states in those years.
+
+BLS is not the only source that published data on coal employment. We compared this data, from the BLS, to [earlier data we had compiled](https://github.com/InsideEnergy/Data-for-stories/tree/master/20150428-coal-production-employment) from the Energy Information Administration, which is based on data from the Mining Safety and Health Administration, and found that the trends were the same.

20150817-coal-employment-BLS/coal_employment_2001_2014.csv

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+Year,IL,IN,KY,MT,ND,OH,PA,TX,WV,WY
+2001,--,--,15253,767,943,--,8420,2341,16537,4285
+2002,3710,2836,14966,746,934,--,7964,2293,16126,4818
+2003,--,2749,13942,693,912,2010,7062,2258,14727,4863
+2004,--,2726,14273,706,914,2039,7212,2219,15873,4838
+2005,--,2604,15409,729,935,2101,7415,2178,17374,5011
+2006,--,2823,16444,797,943,2127,7592,2168,18738,5916
+2007,3773,2890,15391,805,973,2061,7420,2241,18518,6334
+2008,--,2952,16864,846,995,2308,7872,2565,20459,6843
+2009,3492,3154,17170,946,1033,2601,7685,2734,20201,7054
+2010,3424,3093,15990,1026,1068,2480,7772,2841,20461,6932
+2011,3752,3423,16590,1064,1094,2570,8454,2946,23095,7004
+2012,4005,3585,14586,1153,1152,2562,8619,3122,22566,7009
+2013,3664,3531,11676,1116,1173,2369,8002,3162,19980,6648
+2014,3679,3605,10531,1126,1219,--,7307,3478,17862,6541