Correctly state System.ValueTuple dependency for NetStandard 1.1 tfm (A…

…pp-vNext#582)

* State `System.ValueTuple` dependency at nuspec level for NetStandard1.1 tfm
* v7.0.1

Bump build version number in new dev branch

Merge pull request App-vNext#581 from App-vNext/v700

Merge v7.0.0 to master for v7.0.0 release

Clarify v6.1.2 doco

Remove a dead blog post

Merge pull request App-vNext#487 from App-vNext/v610dev

Merge v6.1.0 to master

Merge pull request App-vNext#447 from reisenberger/v601rtm

v6 release-to-market

Merge pull request App-vNext#445 from reisenberger/v6StrongNamePackage

Create V6 strong-name package in pre-release branch

Merge pull request App-vNext#435 from App-vNext/v590

Merge Polly v5.9.0 to master

Make DebuggerStepThrough attributes consistent

... and add missing intellisense