Update OD-flag to use vclocks instead of unique tags.

This makes it more space efficient for large numbers of updates. Also,
added function specs and the binary-roundtrip property.
Update OE-flag to use vclocks instead of unique tags.

This makes it more space efficient for large numbers of updates. Also,
added function specs and the binary-roundtrip property.
Update ignores to disregard EQC artifacts.
Remove lingering comment.
Change od/oe flags to use true/false instead of on/off.
Merge pull request #64 from basho/refactor/sdc/smaller-flags

Improve efficiency of flags.