No need to download Play and add it to your path anymore

Perfect for automatic builds!

I haven't found out what the play2-maven-plugin equivalent of the Build.scala "ebeanEnabled := true" option is yet though so it's not working yet.
org.nanoko.playframework and automatic zip download

* switched back to org.nanoko.playframework:play2-maven-plugin since the other plugin wasn't being maintained (I contacted the developer)
* an ant task now checks if you have play installed, and if not, downloads and installs it to your "target" directory. This does not work for the "clean" lifecycle, but it should work fine for continous integration (assuming Jenkins lets us download a ~200MB zip, and then unzip it. The total disk requirement on Jenkins is probably closing in on 600MB at this point.)
minor pom changes