Adding experimental support for Redis output cache

lib/redis/LICENSE.txt

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+The MIT License (MIT)
+
+Copyright (c) 2014 Stack Exchange
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+===============================================
+
+Third Party Licenses:
+
+The Redis project (http://redis.io/) is independent of this client library, and
+is licensed separately under the three clause BSD license. The full license
+information can be viewed here: http://redis.io/topics/license
+
+This tool makes use of the "redis-doc" library from http://redis.io/documentation
+in the intellisense comments, which is licensed under the
+Creative Commons Attribution-ShareAlike 4.0 International license; full
+details are available here:
+https://github.com/antirez/redis-doc/blob/master/COPYRIGHT
+
+The development solution uses the Redis-64 package from nuget
+(https://www.nuget.org/packages/Redis-64) by Microsoft Open Technologies, inc.
+This is licensed under the BSD license; full details are available here:
+https://github.com/MSOpenTech/redis/blob/2.6/license.txt
+This tool is not used in the release binaries.
+
+The development solution uses the BookSleeve package from nuget
+(https://code.google.com/p/booksleeve/) by Marc Gravell. This is licensed
+under the Apache 2.0 license; full details are available here:
+http://www.apache.org/licenses/LICENSE-2.0
+This tool is not used in the release binaries.