Added some preliminary unit tests for RedisSessionStateItemCollection, modified RedisSessionStateItemCollection class based on the results of some of the tests.

Added some even more preliminary tests for RedisJSONSerializer, added a small optimization to the serializer
Removed a readerwriterlockslim in favor of not having readlocks and just using a mutex in RedisSessionStateItemCollection
Incremented assembly version to 1.1.2, for latest nuget package. This will be the last version before switching to StackExchange.Redis as a redis client
Updated .nuspec file description field
Added NLog package to the sample MVC site

Changed from using BookSleeve to StackExchange.Redis for Redis communication

Removed AsyncBridge as a dependency from RedisSessionProvider because StackExchange.Redis provides synchronous operations itself

Changed the signature of IRedisSerializer to better reflect StackExchange.Redis function parameters (breaking change to the serializer extensibility, but not by much)
Merge pull request #1 from welegan/master

from master