Use ".appveyor.yml" if "appveyor.yml" isn't found

[darconeous]

On Unixy platforms (Linux, BSD, etc), filenames prefixed with a dot (.) are hidden from normal view. By allowing .appveyor.yml to work, you give project maintainers the ability to hide clutter in their project's root directory.

[IlyaFinkelshteyn]

Hi Robert,

We just recently added support for .appveyor.yml with “.” Please give it a try. Note that appveyor.yml without “.” Is still a first choice.

--ilya.

[darconeous]

That sounds fantastic. Thanks!