[FLINK-1062] Type Extraction for Lambdas

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
Disable Checkstyle in java8 package

Checkstyle doesn't seem to support Java 8 yet.
Make Java 8 Doc fit into new doc scheme

This closes #113
[doc] Fix missing Scala Version in index.md
Cleanup LOG.debug to make sure no extra toString and unnecessary String concatenation

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
Remove leftover logback-test.xml in flink-java8.tests
Point quickstart scripts to 0.6.1-incubating
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.

This closes #125
Removed slf4j-simple dependency from streaming component.
Fix Bug in ScalaAggregate Operator and add ITCase
Change Partition Operator to actual general-purpose Operator

It is no longer a special-case operator that can only be used in front
of map-style operations.
[FLINK-1123] Add first-n to Scala API
[FLINK-1120] Add Explicit Partition/Rebalance Operator for Scala API
Update doc with Scala First-N and Partition/Rebalance
Added TPCH query examples for Scala API
Improved Java TPCH query examples
Removed RelationalQuery Java API example
[FLINK-1005] Extend TypeSerializer interface to handle non-mutable object deserialization more efficiently.