Allow for LONG and STRING keys in MGET and MSET.  We can't allow
for other types, as phpredis proper takes a key->value array and
PHP doesn't support other array key types.

Addresses #360
Formatting
Persistent connections with RedisArray

Re-integrating the now old ra-performance branch into a git-flow
branch.  I could have merged it but this was easier with so few
changes
Re-add UNIX socket support to RedisArray

Merging the logic from ra-performance branch into feature/ra-performance
Merge branch 'feature/ra-performance' into develop
Merge branch 'feature/ra_mset_intkeys' into develop