Add engine tests for Mono
Merge pull request #755 from ztone/mono-eval-tests

Add engine tests for Mono
build: switch to xunit.runners NuGet package
build: run acceptance tests from build.sĥ
build: run acceptance tests from travis.yml
build: add .nuget to solution file
Merge pull request #762 from adamralph/706

Run acceptance tests in *nix CI builds