Add idempotency test for out of order append with messages ids previo…

…usly written. MsSql passed and fixed a bug in InMemoryStore.

Package version is in directory.build.props

Set to version 1.0.2

The packages are now versioned independently.(MSSQL is 1.0.1)

Rename common.props to Directory.Build.probs. Metadata now appearing …

…correctly in nuget packages.

Fix assembly versions

Release notes in nuspec and bump to 0.8.1

Fix title

Fix nuspec range, version 0.6.1

Fix dependency version range feck