Fix re-writing of rst files to handle general cases and other cases of "version" than the previous one.
Update the cached _include files.
Correct the download link for the file to use the correct version directory.
Add resolution of CDAP-607 to release notes.
Merge pull request #617 from caskdata/feature/r2.5.2_release_notes

Release 2.5.2 doc fixes
Add a link to the Kafka-Flow-pack, and change copy to use "library" when describing a "pack".
Fix link.
Merge pull request #625 from caskdata/feature/r2.5.2_release_notes

Add a link to the Kafka-Flow-pack to the documentation
Merge pull request #626 from caskdata/release/2.5.0

Release/2.5.0
Spark Integration: SparkPageRank now uses Service
Spark Integration: Addressed comments PR1