Added Kerberos documentation#640

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sejunra wants to merge 7 commits intoapache:masterfrom

sejunra:docs/kerberos

Commits on Feb 15, 2016

Added Kerberos documentation

Sejun Ra
authored and
AhyoungRyu
committed
added license info on doc.

Sejun Ra
authored and
AhyoungRyu
committed
Added Kerberos doc to spark.md instead of having separate file.

Sejun Ra
authored and
AhyoungRyu
committed
Spelled out 'w/' and changed link as requested.

Sejun Ra
authored and
AhyoungRyu
committed
Changed three dots to two dots on link

Sejun Ra
authored and
AhyoungRyu
committed
Address the reviews
AhyoungRyu
committed
Add spaces between the bracket
AhyoungRyu
committed