Fix serializer support for SRANDMEMBER for both one member
and when the count argument is passed.

Addresses #391
Merge branch 'hotfix/srandmember_serialize'
Fixed ra->pconnect parameter in ra_make_array
This parameter was ignored and caused pconnect not to work
Merge branch 'hotfix/redis_array_pconnect'
Enforce offset range limitations for GETBIT and SETBIT

Addresses #401
Merge branch 'hotfix/bitops_offset'