Allow writes from scripts called by AOF loading in read-only slaves.

This fixes issue #1163
Test: regression test for #1163.
Sentinel: parse new INFO replication output correctly.

Sentinel was not able to detect slaves when connected to a very recent
version of Redis master since a previos non-backward compatible change
to INFO broken the parsing of the slaves ip:port INFO output.

This fixes issue #1164
Redis 2.6.14
Fixed typo in 2.6.14 changelog. verison -> version.
Merge remote-tracking branch 'antirez/2.6' into 2.6