Merge branch 'hotfix/SLIDER-349-headers'
Merge branch 'release/slider-0.50.2'
SLIDER-398. memcached package is broken
Merge branch 'master' of https://github.com/apache/incubator-slider into tajo

Conflicts:
	app-packages/memcached-win/metainfo.xml
	app-packages/memcached/metainfo.xml
Fixed tajo-env.sh template.