ARROW-3013: [Website] Fix download links on website for tarballs, checksums#2613

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kszucs wants to merge 4 commits intoapache:masterfrom

kszucs:ARROW-3013

Commits on Sep 23, 2018

switch to sha256 andh sha512 checksum linnks on site
kszucs
committed

Commits on Sep 28, 2018