Initial directory structure for lcb 2.3
Add libcouchbase 2.3 documentation

Note this is still missing release notes
Some modifications per matt's comments
Add releasenotes for libcouchbase 2.3
Merge pull request #110 from mnunberg/stage

Add libcouchbase 2.3 documentation
.NET SDK: fix conversion error in exponential value (NCBC-430)
.NET SDK: remove reference to RESTsharp.dll (NCBC-429)
C SDK: edits for v2.3 new content and release notes