Changed scala copyright header.
Updated license notices in in java files to be written in block comments instead of javadoc comments.
[FLINK-1114] Move scala-style checks to scala projects, change paths to style conifg, to allow isolated building of individual projects.
[FLINK-1115] Local file streams retry file creation on FileNotFoundException to increase resilience against spurious failures in tests
Improve error message when scheduler cannot find a slot for immediate scheduling.
Improve robustness of task manager test
Remove error message in execution graph for concurrent state changes that are fully acceptable.
Tasks are marked correctly as failed (not canceled), when the taskmanager kills then during shutdown or reset.
Limit number of RPC worker threads in TaskManager to prevent OutOfMemory (thread space) errors
[FLINK-1077] Fix unstable test CliFrontendPackageProgramTest
[FLINK-1119] Make sure test mini cluster has started properly before submitting the test job.
Change logging backend of SLF4j from Logback to Log4j for better compatibiltiy with YARN.
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.