Merge pull request #94 from dirkrombauts/master

Update NuGet packages
Merge pull request #95 from dirkrombauts/master

Improve testability of Pickles by using MockFileSystem in all tests
Merge pull request #96 from dirkrombauts/master

Try to make teamcity build pass again
Merge branch 'master' of https://github.com/picklesdoc/pickles