It is no longer a special-case operator that can only be used in front
of map-style operations.

We'll still ship the Logback configuration file and pass them their path to the JVM so that
users can use Flink with Logback as well.

This closes #125

Remove unnecessary type check and cast for FileInputSPlit.

Update LOG.debug to user SLF4J parameterized logging or protected by LOG.isDebugEnabled to save toString and String concat.

Remove unnecessary semicolons.

This closes #127

This closes #113

Checkstyle doesn't seem to support Java 8 yet.

Checking for Java support

Small changes and meaningful exception for unsupported compilers

pom.xml modified to use JDT compiler

Project structure refactored, examples added

Documentation added

Quickstart adapted

Also update documentation accordingly.

[FLINK-1103] [streaming] Updated WordCount example to become self-contained and removed old TestDataUtil

Conflicts:
	flink-addons/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/datastream/DataStream.java

Conflicts:
	flink-addons/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/JobGraphBuilder.java
	flink-addons/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/StreamConfig.java
	flink-addons/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/datastream/ConnectedDataStream.java
	flink-addons/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/datastream/DataStream.java

[streaming] added batchReduceGroup, windowReduceGroup functionality to ConnectedDataStream and GroupedConnectedDataStream

Excluded DataSet.first(), UnsortedGrouping.first(), and SortedGrouping.first() methods from ScalaAPICompletenessTest.

This closes #88

- GroupReduceCombineDriver uses separate comparators for sorting and grouping.
- Adding support for multiple comparators for a single input driver required some refactoring.

This closes #109

[FLINK-1060] Added methods to DataSet to explicitly hash-partition or rebalance the input of Map-based operators.

This closes #108