Merge pull request #207 from ldecicco-USGS/master

version update

DESCRIPTION

 Package: dataRetrieval
 Type: Package
 Title: Retrieval Functions for USGS and EPA Hydrologic and Water Quality Data
-Version: 2.5.3
-Date: 2016-03-04
+Version: 2.5.4
+Date: 2016-04-7
 Authors@R: c( person("Robert", "Hirsch", role = c("aut"),
     email = "rhirsch@usgs.gov"),
     person("Laura", "DeCicco", role = c("aut","cre"),