This closes #2324

Makes the JUnit test utils (TestLogger, retry rules, ...) properly available to
other projects without the 'flink-core' test-jar, via the 'flink-test-utils-junit' project.

Makes the ForkableMiniCluster, TestEnvironment,  and other test utilities available in the 'main'
scope of the 'flink-test-utils' project.

Creates a 'flink-test-utils-parent' project that holds the 'flink-test-utils-junit' and
'flink-test-utils' project.

Also moves some tests between projects and inlines some very simple utility functions in
order to simplify some test jar dependencies.

This closes #1915

This closes #1876

Consolidation is done via plugin management.

Closes #1753

This closes #1710.

[FLINK-3460] [build] Set Flink dependencies in flink-streaming-connectors, flink-batch-connectors, cep, gelly and flink-ml modules to provided

The flink-streaming-connectors all depend on flink-streaming-java in compile scope.
This entails that this dependency is always pulled in, when you build a fat jar. By
setting this dependency to provided, this will be avoided. Furthermore, the connectors
are always used in conjunction with flink-streaming-java. This means that you will
always have an explicit dependency import of flink-streaming-java in your build script.
This allows you to run your program locally but it is also easy to exclude the dependency
from being included in the fat jar by setting it to provided, as well.

This closes #1683.

- add suffixes
- adapt change-scala-version script

This closes #1529.

This closes #1492
This closes #1482

0.10-SNAPSHOT continues on branch release-0.10

This closes #1234.

Closes #851

Adds html titles. Adds explicit operation section to all operators.

This closes #727.

Adds pipeline comments

Adds pipeline IT case

Added Stochastic Gradient Descent initial version and some tests.

Added L1, L2 regularization.

Added tests for regularization, fixed parameter setting.

Added documentation.

Added option to provide UDF for the prediction function, moved SGD regularization to update step.

Added prediction function class to allow non-linear optimization in the future.

Small refactoring to allow calculation of regularized loss separatly from
regularized gradient.

This closes #613.

This closes #543.

[FLINK-1794] [test-utils] Adds scala docs to FlinkTestBase

This closes #540.

[FLINK-1697] [ml] Adds web documentation for alternating least squares. Adds web documentation for polynomial base feature mapper.

[ml] Adds comments

[ml] Set degree of parallelism of test suites to 2

[ml] Replaces FlatSpec tests with JUnit integration test cases in order to suppress the sysout output.

[ml] Adds missing clients-test jar

[docs] Sets jekyll's baseurl to http://ci.apache.org/projects/flink/flink-docs-master

[ml] Replaces JBlas by java netlib to avoid license issues of included fortran libraries

[ml] Adds com.github.fommil.netlib:core to license file

[ml] Adds Scala docs to FlinkTools

[ml] Adds comments to LabeledVector and the math package object

This closes #479.

[ml] Adds batch gradient descent linear regression with convergence criterion as relative change in sum of squared residuals

[ml] Adds comments to MultipleLinearRegression

[FLINK-1695] [ml] Initial commit to establish module structure. Adds simple Vector and Matrix types.