aliases may not start with an underscore

Thanks to @areggiori for reporting.
https://github.com/dbpedia-spotlight/pignlproc/pull/10#issuecomment-19822399
updated hadoop and bliki versions in pom
moved experimental indexing scripts to experimental/
Merge pull request #11 from chrishokamp/master

Update hadoop version to 1.1.0 and bliki version to 3.0.19

Also, move experimental scripts to own folder.
Merge remote-tracking branch 'upstream/master'