Tagging v160223

Merge branch 'release/160221'

Tagging v160221

Releasing ZenCache v160216-RC (Release Candidate)

Releasing Comet Cache Lite v160211

Releasing ZenCache Lite v160120-RC (Release Candidate)

See websharks/zencache.com#74

Tagging 160103

Merge branch 'release/151216'

Tagging 151216

Standardize on using 'OPcache' spelling (instead of 'OPCache')