BLD: fix appveyor builds to use miniconda
The py34/win32 build fails on AppVeyor due to some strange numpy import issue (see https://github.com/ContinuumIO/anaconda-issues/issues/1508 for a siimilar problem), so we try to mark that as knownfail ...
The py34/win32 build fails on AppVeyor due to some strange numpy import issue (see https://github.com/ContinuumIO/anaconda-issues/issues/1508 for a siimilar problem), so we try to mark that as knownfail ...