Fixes on CDH4 build / Maven improvements:
- remove usages of commons-lang (we use only commons-lang3, as defined in flink-runtime/pom.xml)
- Upgrade maven failsafe to 2.17 so that tests also fail if the test errors (exceptions during execution)
- added new build profile "docs-and-source" that creates javadocs and source attachments. These are usually only needed when releasing (--> speed up the build)
[FLINK-1046] Made sure that Client uses correct user-code class loaders.
Add Sanity Checks for Join/CoGroup with SolutionSet in Record API

We now check whether the key fields specified for the delta iterations
match those specified when joining/coGrouping with the solution set.
This code is more or less copied from the new Java API.

The Scala API uses the Record API underneath so it is also covered.
[FLINK-1047] Fixes main class for start-local.bat
[FLINK-1048] Swallow output of SET statements in ./bin/flink.bat
[FLINK-1051] ./bin/start-local.bat prints error message if java.exe cannot be found
Another fix for CDH4 compliance
Adjusted examples packaging to only create jars for fully self-contained examples.
[FLINK-1053] Add "mapPartition" operator.
[FLINK-1053] Cleanup implementation of mapPartition function

This closes #42
Small bug fixes for running hadoop output formats

This closes #75
[FLINK-1054] Fix job history view in web frontend
[FLINK-1006] Added support for the MapR file system
make CI build faster

This closes #97
Run tests in parallel

This uses the forkCount parameter of surefire/failsafe. This also
changes the JVM memory size for the testing VMs so that more can fit
into memory.

For this to work, NepheleMiniCluster must recognize when it is run in
a parallel testing environment and change ports accordingly. Also
AbstractTestBase and TaskTestBase must prefix temp files with the class
name to prevent name clashes.

This closes #96
[FLINK-977] Improve error reporting for failed TM connection.

This closes #98
[streaming] Initial commit
[streaming] updated README
[streaming] Initial source commit
[streaming] JobGraphBuilder refactor