Squashed commit of the following:

commit 5a1a6dc6ba914d817d35a3a7813c547803fecca1
Author: Marcus Leich <marcus.leich@tu-berlin.de>
Date:   Sun Jul 7 22:42:40 2013 +0200

    fixed: Nullpointer Exception when DEBUG logging is enabled

commit 636acb012001e6beb392deddd6f634cee9257986
Author: Marcus Leich <marcus.leich@tu-berlin.de>
Date:   Fri Jul 5 17:06:39 2013 +0200

    changed: nephele visualization startup script adapted

commit ec31d56491eb0a4d74c2b2387f13bb8947dda8b6
Author: Marcus Leich <marcus.leich@tu-berlin.de>
Date:   Fri Jul 5 16:49:16 2013 +0200

    changed: separated pact-clients libraries from the lib folder

commit afa27a75217c2e69acbbcd1a304fdb94b25c935a
Author: Marcus Leich <marcus.leich@tu-berlin.de>
Date:   Wed Jul 3 17:02:50 2013 +0200

    changed: POMs now use proper dependency management again

commit 67455362220f659c33cd3ce84f36098707fb3543
Author: Marcus Leich <marcus.leich@tu-berlin.de>
Date:   Wed Jul 3 17:02:03 2013 +0200

    fixed: FileSystem instanciation for Cloudera Hadoop

commit 584079d7d785eab53101605dd3f06bb65ff52d66
Author: Marcus Leich <marcus.leich@tu-berlin.de>
Date:   Tue Jul 2 23:50:36 2013 +0200

    new: support for newer Hadoop versions

commit 70dc817703a68f6b373103638f89baaa2b424a61
Author: Marcus Leich <marcus.leich@tu-berlin.de>
Date:   Tue Jul 2 21:10:13 2013 +0200

    changed guava version to less ancient 14.0.1

Change-Id: I803fec466c2fc526521463fe3ccf15d7cb44ec40