v0.4.1: Depwarns and CI for julia 1.0 (#70)

* project file: new test dependency format

* CI test on 1.0

appveyor.yml switched to template from AppVeyor.jl

* fix isbits to isbitstype deprecation

* update REQUIRE to the 0.7 release

* fix IOError: unlink: operation not permitted (EPERM)