VS2013 compatibility
chromeWithUserAgent & firefoxWithUserAgent made private
Merge pull request #122 from JonCanning/master

Tidying a few type inferences
Merge pull request #121 from JonCanning/PrivateMethods

chromeWithUserAgent & firefoxWithUserAgent made private
Merge pull request #120 from JonCanning/VS2013

VS2013 compatibility and fixed WebDriver refs in documentationtests.fsproj