Adds multiget and multiput to hbase store

[MansurAshraf]

Adds multiget and multiput to hbase store to increase performance

[MansurAshraf]

Can someone re-trigger the build? There was an error last time

[rubanm]

Done..

[rubanm]

seems unused

[johnynek]

Sorry I was slow to comment here. Looking forward to merging soon.

Do want to find a solution to tho K <% Array[Byte] pattern.

trait Hash[-K, +T] {
  def hash(k: K): T
}

has been proposed a few times. We need to think of some laws for it: maybe:
``Equiv.equiv(k1, k2) => hash(k1) == hash(k2)andProb(hash(k1) == hash(k2) | k1 != k2) <= eps` for some value of eps.

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