Merge pull request Netflix#787 from Netflix/dev

Update v0.6 branch with latest fixes/improvements

Merge pull request Netflix#745 from smukil/fix_hdel_repair_script

Replicas shouldn't update top level rem-set on final field delete

Merge pull request Netflix#740 from smukil/in_flight_nonrepairable_cr…

…ash_fix

Turning on repairs shouldn't invoke repairs for in-flight queries

Merge pull request Netflix#737 from Netflix/dev

Merge dev into v0.6

Merge pull request Netflix#735 from Netflix/dev

Merge dev into v0.6

Merge pull request Netflix#732 from Netflix/dev

Merge dev into v0.6

Merge pull request Netflix#730 from Netflix/dev

Merge dev into v0.6

Merge pull request Netflix#721 from smukil/fix_msg_leak_for_each_safe…

…_quorum

Fix msg leak with DC_EACH_SAFE_QUORUM

Merge pull request Netflix#720 from Netflix/dev

[Beta] Add DC_EACH_SAFE_QUORUM consistency level

Merge pull request Netflix#717 from Netflix/dev

Merge dev into 0.6