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

This reverts commit af79a3789b44bc120caf4363aab04c5cb110a1c6.
CDAP-988 introducing a setting for enabling writes to datasets
through Hive, which will be false by default. This will always
be false for CDH4, due to problems in that Hive version with using
unmanaged tables with custom output formats.
CDAP-988 remove unneeded changes.
CDAP-988 change default for hive writes to true to be consistent
with previous behavior. Also adding a known issue to the release
notes.
Merge pull request #815 from caskdata/feature/CDAP-943-ignore-duplicate-conf-files

CDAP-943 Ignore duplicate files in classpath
Merge pull request #820 from caskdata/hotfix/CDAP-988-cdh4-explore-fix

Hotfix/cdap 988 cdh4 explore fix
Merge pull request #826 from caskdata/release/2.6.0

Release/2.6.0