ARROW-104: [FORMAT] Add alignment and padding requirements + union clarification #67

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emkornfield wants to merge 2 commits intoapache:masterfrom

emkornfield:emk_format_changes

Commits on Apr 23, 2016

Add alignment and padding requirements. update union types buffer to reflect using only 1 type buffer
emkornfield
committed

Commits on Apr 25, 2016

fixes per code review
emkornfield
committed