Update src/sphinx/tutorials/play20scalaide20/index.rst

Now, in Play 2.1, ``eclipsify`` is called ``eclipse``

https://groups.google.com/forum/?fromgroups=#!topic/play-framework/eQs5tHQqZBM
Merge pull request #41 from Nullpo/patch-1

Update src/sphinx/tutorials/play20scalaide20/index.rst