Add broken test showing problem with AddGlobalIgnore when the property name exists on both source and destination but types are not compatible.
Global ignores actually ignore now
Adding global ignores to all type map creation paths
Merge branch 'ntent-ad-develop' into develop

Closes #585
Resetting expression cache on mapper.reset; fixes #614
Skipping overridden types during validation; fixes #574
Update README.md

Adding the link to NuGet package
Merge pull request #640 from abatishchev/patch-1

Update README.md
Ignoring some VS 2015 folder
Updating to 4.5.1; using Roslyn compiler