Merge pull request #234 from alig/master

Updated documentation about the YARN v2.2 build process
(cherry picked from commit 241336add5be07fca5ff6c17eed368df7d0c3e3c)

Signed-off-by: Patrick Wendell <pwendell@gmail.com>
Merge pull request #235 from pwendell/master

Minor doc fixes and updating README
(cherry picked from commit e5d5728b72e58046cc175ab06b5f1c7be4957711)

Signed-off-by: Patrick Wendell <pwendell@gmail.com>
Merge pull request #236 from pwendell/shuffle-docs

Adding disclaimer for shuffle file consolidation
(cherry picked from commit 1b38f5f2774982d524742e987b6cef26ccaae676)

Signed-off-by: Patrick Wendell <pwendell@gmail.com>
Merge pull request #237 from pwendell/formatting-fix

Formatting fix

This is a single-line change. The diff appears larger here due to github being out of sync.
(cherry picked from commit 10c3c0c6524d0cf6c59b6f2227bf316cdeb7d06c)

Signed-off-by: Patrick Wendell <pwendell@gmail.com>