[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
Remove obsolete collection execution example.
Correct remote collector format example.
Implement coarse-grained fault tolerance
Introduce a delay before restarts to make sure that taskmanager failures are detected before restart.
Improve error messages in case of invalid file paths or URIs

This closes #170
Make sure TaskManager does not accept task deployments when shutting down
[FLINK-1205] Fix library cache manager to track references to tasks and revent accidental duplicate registration/deregistration
[FLINK-1203] Use forked execution in all tests, except in the end-to-end integration tests in flink-tests
[FLINK-1198] Broadcast variables are shared between tasks in the same TaskManager
[FLINK-1198] Make Broadcast variables shared per taskmanager, rather than a shared singleton per JVM
             (supports multiple TaskManagers in the same JVM)