Minor change to WrapperBase

Merge new stuff

fix minor mistype on comment.

Update KeysScan.md

Add basic tests for keyspace isolation; use polymorphism for Condition re-writing; slight tweaks to wrapper construction (no double-wrapping, for example)

Key space isolation extension to IDatabase

Critical fix: ReconfigureAsync was incorrectly spinning up new ServerEndPoint instances after disconnect

fix typo

do a better job of detecting master/slave changes by optionally performing an "info replication" on a loop

Cannot access a disposed object when auth fails Issue #50 and connection fails to reconnect with retry when cache is under load #65

adding support for most Sentinel methods

Merge branch 'patch-1' of https://github.com/stas-sultanov/StackExchange.Redis into stas-sultanov-patch-1

Conflicts:
	StackExchange.Redis/StackExchange/Redis/ConfigurationOptions.cs

Note: tweaked a bit

Spelling fix