Removing wrapper task since it is no longer rewuired by Gradle 1.7
Extending semnatics for method File.copyTo(source,target) so that when 'target' argument
is a directory, it copy the 'source' file to that folder, with the same name of the original file
Fixing comment typo
Fixing a ClassCastEx exception when the 'bin' folder is added to the PATH
Fixing an issue which raise an error "error=26 Text file busy" on some platforms (CentOS)

See
  http://stackoverflow.com/q/6345660/395921
  https://issues.apache.org/jira/browse/MAPREDUCE-2374