TEZ-1648. Update website after 0.5.1
TEZ-1614.  Use setFromConfiguration() in SortMergeJoinExample to demonstrate the usage (Rajesh Balamohan)
Adding TEZ-1614 to CHANGES.txt
Adding TEZ-1614 to CHANGES.txt
TEZ-1641. Add debug logs in VertexManager to help debugging custom VertexManagerPlugins
TEZ-1645. Add support for specifying additional local resources via config. (hitesh)
Fix CHANGES.txt to reflect correct commits to 0.5.
TEZ-1646. Add support for augmenting classpath via configs. (hitesh)
TEZ-1579. set mapreduce framework name to yarn-tez in MR examples
TEZ-1608. TopK example using the native TEZ api

Signed-off-by: Krisztian Horvath <krisztian.horvath@sequenceiq.com>