Added local strategy SORT to DataSinkTask and extended DataSinkTaskTest correspondingly
Update commons-io artifact to same version as everywhere else.

Use the new cooridnates for it.
Fix a warning in pact-hbase/pom.xml.
Unified config and added YAML (syntax) support (#113)

- Unified config to stratosphere-conf.yaml, which replaces the old
  nephele-user.xml and pact-user.xml and is also read by
  bin/nephele-config.sh

- Removed some settings from config:
    * instance configuration
    * multicast for broadcast
    * profiler impl classes
    * jobclient.polling.interval (adjusted default from 5 to 2)
    * pact.runtime.fs_timeout
Improve pom-tooling scripts

Pom-generate script now allows to specifiy a filename for the pom
new script to rename poms
Added early checks against invalid null inputs to contracts.
Reqorked branch handling method in sink joiner to report when a disjoint data flow graph is found.

Added test case for catching simple disjoint cases.
Added test case for a more complex case of a branching but disjoint data flow graph (deactivated now, as it is not yet caught by the compiler).