Update LICENSE

LICENSE

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-U.S.Geological Survey Software User Rights Notice
-
-Copied from http://water.usgs.gov/software/help/notice/ on December 6, 2013.  
-Please check webpage for updates.
-
-Software and related material (data and (or) documentation), contained in or 
-furnished in connection with a software distribution, are made available by the 
-U.S. Geological Survey (USGS) to be used in the public interest and in the 
-advancement of science. You may, without any fee or cost, use, copy, modify, 
-or distribute this software, and any derivative works thereof, and its supporting 
-documentation, subject to the following restrictions and understandings.
-
-If you distribute copies or modifications of the software and related material, 
-make sure the recipients receive a copy of this notice and receive or can get a 
-copy of the original distribution. If the software and (or) related material are 
-modified and distributed, it must be made clear that the recipients do not have 
-the original and they must be informed of the extent of the modifications. For 
-example, modified files must include a prominent notice stating the modifications 
-made, the author of the modifications, and the date the modifications were made. 
-This restriction is necessary to guard against problems introduced in the software 
-by others, reflecting negatively on the reputation of the USGS.
-
-The software is public property and you therefore have the right to the source 
-code, if desired.
-
-You may charge fees for distribution, warranties, and services provided in 
-connection with the software or derivative works thereof. The name USGS can be 
-used in any advertising or publicity to endorse or promote any products or 
-commercial entity using this software if specific written permission is obtained 
-from the USGS.
-
-The user agrees to appropriately acknowledge the authors and the USGS in 
-publications that result from the use of this software or in products that 
-include this software in whole or in part.
-
-Because the software and related material are free (other than nominal materials 
-and handling fees) and provided "as is," the authors, the USGS, and the United 
-States Government have made no warranty, express or implied, as to accuracy or 
-completeness and are not obligated to provide the user with any support, consulting, 
-training or assistance of any kind with regard to the use, operation, and performance 
-of this software nor to provide the user with any updates, revisions, new versions 
-or "bug fixes".
-
-The user assumes all risk for any damages whatsoever resulting from loss of use, 
-data, or profits arising in connection with the access, use, quality, or 
-performance of this software.
+CC0 1.0 Universal
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+Statement of Purpose
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