1.1.1

This release mostly contains bug fixes that, all in all, should make things much less buggy on Windows!

Bug fixes

• Fix permissions on exercise files (@zacanger, #133)
• Make installation checks more thorough (@komaeda, 1b3469f)
• Fix order of true/false in tests for executables (@mgeier, #137)
• Stop run from panicking when compile fails (@cjpearce, #141)
• Fix intermittent test failure caused by race condition (@cjpearce, #140)
• Fix links by deleting book version (@diodfr, #142)
• Canonicalize paths to fix path matching (@cjpearce, #143)