Fix broken links.
Merge pull request #610 from caskdata/feature/r2.5.2_release_notes

Fix broken links.
Added known issue: CDAP-599 https://issues.cask.co/browse/CDAP-599 .
Adjust links.
Updated for comments. Moving comment on MovieRecommender to its README.
Merge pull request #611 from caskdata/feature/r2.5.2_release_notes

Feature/r2.5.2 release notes
(CDAP-607) Fix wrong byte code generated when calling slf4j Logger.
(CDAP-588) Instead of create a flatten program jar, just adds all jars used to create ProgramClassLoader as dependency jars when launch spark job.
Merge pull request #616 from caskdata/feature/fix-handler-bytecode

(CDAP-607) Fix wrong byte code generated when calling slf4j Logger.
Merge pull request #618 from caskdata/feature/fix-spark-runner

(CDAP-588) Don't flatten user program jar
Merge branch 'release/2.5.0' into develop

Conflicts:
	cdap-unit-test/src/test/java/co/cask/cdap/test/app/TestFrameworkTest.java