CDAP-943 Ignore duplicate files in classpath
Revert "CDAP-943 Copy Twill's latest unreleased ApplicationBundler"

This reverts commit af79a3789b44bc120caf4363aab04c5cb110a1c6.
Merge pull request #815 from caskdata/feature/CDAP-943-ignore-duplicate-conf-files

CDAP-943 Ignore duplicate files in classpath