revert to use msbuild libraries that come with the core framework, which requires eliminating .net 4.51 checking when building proto compiler.
when building the protocompiler, Seq.list is not available so instead use copied implementation for generalized slicing parser only when building proto compiler.

Revert "Add AppVeyor status badge"

Add AppVeyor status badge

Git is not interested in the build output directories vsdebug and vsrelease and also not the nuget packages directory

closes #176

fixes #170
closes #173

fixes #163
closes #172

commit 1d8b42efda514357bcb14bd1838a4e9c6dc3cdab
Author: Don Syme <dsyme@microsoft.com>
Date:   Thu Jan 29 10:15:54 2015 +0000

    NOP commit to run appveyor

commit 290c154a5c68c517a395db0c57553a45b5dea85e
Author: Don Syme <dsyme@microsoft.com>
Date:   Thu Jan 29 01:13:14 2015 +0000

    minor update to fix

commit 210201dcce89c9d1875056686c57093b5df04a32
Author: Don Syme <dsyme@microsoft.com>
Date:   Thu Jan 29 01:06:30 2015 +0000

    FIx #163 - Array2d.* don't work on non-zero-based arrays

fixes #30
closes #167

commit ef01ef3962261a4f091c1d8f7c74423274bade28
Author: andrewjkennedy <akenn@microsoft.com>
Date:   Thu Jan 29 15:21:05 2015 +0000

    Whitespace change to kick AppVeyor

commit 6cc2e7734f867fe976cd63bc33d7cfe35161710b
Author: andrewjkennedy <akenn@microsoft.com>
Date:   Thu Jan 29 10:02:20 2015 +0000

    Regression test for issue #30

commit 72635a9929fb09dd58b9b3e071247a22458d78b8
Author: andrewjkennedy <akenn@microsoft.com>
Date:   Wed Jan 28 12:42:32 2015 +0000

    Fix for https://github.com/Microsoft/visualfsharp/issues/30
    Code was comparing a pre-erasure list of arguments with a post-erasure list

fixes #122
closes #144

commit f138b61d9fc2303d510aa59aff308f6b65fa26b9
Author: Don Syme <dsyme@microsoft.com>
Date:   Thu Jan 29 12:19:37 2015 +0000

    enable codegen as smoke tests

commit 20b1e81d542a8a3fef891013e5e36a12c5e14fb0
Author: Don Syme <dsyme@microsoft.com>
Date:   Thu Jan 29 12:18:26 2015 +0000

    update baselines for tests

commit b43c3279767344c5fca2e59ce9f2c3d953d6aaed
Merge: 4a83340 d17d429c
Author: Don Syme <dsyme@microsoft.com>
Date:   Thu Jan 29 11:59:17 2015 +0000

    Merge branch 'fsharp4' of http://github.com/Microsoft/visualfsharp into fix-122

commit 4a833409c30407a7409904ac73baae7f0197a675
Author: Don Syme <dsyme@microsoft.com>
Date:   Thu Jan 29 10:17:43 2015 +0000

    NOP commit to run appveyor

commit 2fb9f57e5085f709aca6a9bbe03f0ca653a21247
Author: Don Syme <dsyme@microsoft.com>
Date:   Tue Jan 27 17:44:49 2015 +0000

    fix and tests for #122 - no .volatile emitted on stfld

Minimal PR to enable appveyor support

- Remove an unused resource string from fscomp.txt
- Remove use of named DU field syntax (LKG compiler does not understand it)

Conflicts:
	src/fsharp/FSharp.Core/array.fs
	src/fsharp/FSharp.Core/seq.fs

Show warning when Record is accessed without type but RequireQualifiedAccess was set - relates to #95

closes #137

Also include the License file in VSIX

closes #139

commit ebc858ee82b32fbddc26ddbbc2dc4496b2b5ea6e
Author: Anh-Dung Phan <phananhdung309@yahoo.com>
Date:   Tue Jan 27 12:56:30 2015 +0000

    Ignore a few files generated by VS 2015

commit addaa2e343c2b69b925d4db764b05ed3ceb393bf
Author: Anh-Dung Phan <phananhdung309@yahoo.com>
Date:   Tue Jan 27 12:56:08 2015 +0000

    Make sure that EnableOpenSource is installed on VS 2015

    Also include the License file in VSIX