Release 1.8

Fix formatting

Merge pull request praeclarum#873 from praeclarum/updatetests

Update tests to NUnit 3

Bump SQLitePCLRaw to 1.1.11 in sqlcipher

Merge pull request praeclarum#588 from praeclarum/std2

Improve .NET Standard nuget

Prepare for 1.3.3 release

Fix doc comments

Release 1.3.0 with .NET Standard

Fix PCL nuget build