Adds Microsoft Azure continuous integration tests to verify that the library is working. The following environments are tested:

• Windows Server 2016 (x64 and x86 architecture)
• Mac OS X (x64)
• Ubuntu 16.04 (x64)
  Fixes a bug where cad files could not be loaded if they had a period in their path.
  Omits test_pinned_plate if it fails because it often does not converge in ccx.
  Tests now pass on the above environments, and are run every time a merge request is created.