Merge pull request #519 from colinbull/HtmlTypeProvider

Preping HTML Provider for release
Update appveyor.yml
Update .gitattributes
Update to AppVeyor non-beta
Update to AppVeyor non-beta
Update AssemblyResolver.fs
Update expected
Revert Freebase changes to throw exceptions sooner
Update RELEASE_NOTES.md
Update FSharp.Data.nuspec
Fix #523
Fix #523
Remove obsolete CharRef + Trim whitespace when creating DOM + .ToString() for HtmlElement + Test for #524 + Remove warning
Merge remote-tracking branch 'upstream/master' into HtmlTypeProvider
very much work in progress on write functionality for the json tp
Merge branch 'master' into JsonWriteAPI
Move most of the json creation logic stuff to runtime
Update expected files for signature tests
Refactoring + bug fixing
Fix heterogeneous values + remove IJsonDocument parameters + add test