Improve ResultTransformer performance (NH-3382)
StringHelper - add method Join which operates with generic IEnumerable<T>
Add test with criteria for NH-3074
Merge branch '3.3.x'
Remove code duplication in unwrapping nullable types
Restructure gitignore so that binaries and build related Visual Studio files are only ignored below the src directory. This will avoid ignoring e.g. binaries in the Tools directory, which we do want to commit.

Add nunit-editor.exe previously missing due to this.
Update to Iesi.Collections 4.0.1. Include pdb to fix NH-3185.
Implemented filtering of collections with linq (for PersistentGenericBag only)
Remove hack with positional parameter in query.
Complex filtering example