download any new corpora before running tests
Merge pull request #499 from stevenbird/master

Added partial support for mapping of tagsets.
jenkins was configured to pull source form an nltk fork instead of the original repository
Merge pull request #503 from hleeldc/jenkins

Updated Jenkins job config file to get source code from original NLTK repository
Merge branch 'master' of https://github.com/stevenbird/nltk
Merge branch 'master' of https://github.com/nltk/nltk
Tree.node() and Tree.set_node() changed to Tree.label() and Tree.set_label(); Tree.node() raises notImplementedError
removed emacs files inadvertently included with commit