Ensure-Exists is necessary for build.ps1, add it back.
Merge pull request #249 from narnaud/fix-build

Ensure-Exists is necessary for build.ps1, add it back.
Reintroduce VS2013 dlls.

Fixes #246.
Ignore version files.

Version files don't need to be tracked.
Merge branch '1.1.4.1' into development