v0.4.0: enable appveyor (#70)

* enable appveyor

* remove outdated test/REQUIRE

* allow failures on 0.7 and 1.0

v0.3.2: Merge pull request #47 from carlobaldassi/notypealias

typealias -> const (fix dep.wan. on julia 0.6)

v0.3.1: Merge pull request #46 from JuliaOpt/ml/check

option to not check warmstarts