Handle empty contents in is_head/1. Unknown issue with empty contents…

… objects causing errors during fullsync.

Update bitcask tag.

bump version for gpb issue.

correct tag for pipe and eqc plugin.

Updated rebarconfig

compatible version of the itr_filter_fun for riak-2.2.12, to be place…

…d into a riak-2.2.11 package

rebar.config changes

Develop 2.2.8 bugfix vnode shutdown crash (#5)

bugfix: to stop riak_kv_vnode crashing on a node stop, due to long running hashtree updates (longer than 60 seconds).

changed rebar.config to point to new 2.2.9 bitcask tag

updated bitcask tag