[build tools] update release sciprts
Set version to 0.8-incubating-SNAPSHOT
[FLINK-1189] [streaming] Added cross operator

Conflicts:
	flink-addons/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/datastream/ConnectedDataStream.java
[FLINK-1189] [streaming] Temporal cross refactor

Conflicts:
	flink-addons/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/datastream/ConnectedDataStream.java
[FLINK-1175] [streaming] GroupBy updated to allow multiple field and keyselector groupings
[FLINK-1188] [streaming] Updated aggregations to work also on arrays by default
[streaming] Removed obsolete state objects from streaming-core
[FLINK-1185] [streaming] OperatorState and StateCheckpoint classes and implementations added for state checkpointing and rebalancing
[FLINK-1187] [streaming] StreamingRuntimeContext added with API support for registering fault tolerant state objects for the operators
[FLINK-1178] Changed type preference to ValueType, WritableType, CaseClassType

This closes #162
Remove unnecessary final modifier in PlanExecutor.loadExecutorClass method

Remove unnecessary final modifier in PlanExecutor.loadExecutorClass private static method because private means you can not override this method.

Author: Henry Saputra <henry.saputra@gmail.com>

Closes #163 from hsaputra/remove_unneeded_final_privatetatsic_planexecutor and squashes the following commits:

fe7afc7 [Henry Saputra] Remove unnecessary final modifier in PlanExecutor's private static method.
[FLINK-1194] Fix Java quickstart archetype POM file

This closes #165
Add DeltaPageRank example
[FLINK-1182] Improve error messages for POJO type mismatches
[FLINK-1181] Fix IOReadableWritable checks in RPC service

This closes #167
Fix version and download paths in docs config
[docs] Various fixes in docs
  - corrected links to download page
  - corrected download urls
  - corrected wget shortcut for yarn setup
  - corrected links to faq in yarn setup
  - corrected guide for manual yarn build
  - FAQ layout
Another round to remove final modifier to private methods because it is not needed

Remove final modifier to private methods because it is not needed.
Those methods are final by default.

Author: Henry Saputra <henry.saputra@gmail.com>

Closes #168 from hsaputra/remove_final_privatemethods_1 and squashes the following commits:

860b512 [Henry Saputra] Remove final modifier to private methods because it is not needed. It is final by default.
[FLINK-1203] Deactivate fork reuse in tests (workaround for potential surefire bug)

This closes #174
[FLINK-1202] Remove incomplete file outputs on failure

This closes #175