[MLLIB][SPARK-5502] User guide for isotonic regression

User guide for isotonic regression added to docs/mllib-regression.md including code examples for Scala and Java.

Author: martinzapletal <zapletal-martin@email.cz>

Closes #4536 from zapletal-martin/SPARK-5502 and squashes the following commits:

67fe773 [martinzapletal] SPARK-5502 reworded model prediction rules to use more general language rather than the code/implementation specific terms
80bd4c3 [martinzapletal] SPARK-5502 created docs page for isotonic regression, added links to the page, updated data and examples
7d8136e [martinzapletal] SPARK-5502 Added documentation for Isotonic regression including examples for Scala and Java
504b5c3 [martinzapletal] SPARK-5502 Added documentation for Isotonic regression including examples for Scala and Java

1 files changed, 100 insertions, 0 deletions

diff --git a/data/mllib/sample_isotonic_regression_data.txt b/data/mllib/sample_isotonic_regression_data.txt
new file mode 100644
index 0000000000..d257b509d4
--- /dev/null
+++ b/data/mllib/sample_isotonic_regression_data.txt
@@ -0,0 +1,100 @@
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\ No newline at end of file