minio server simplified its build system, this
change borrows the same technique to `mc` as well.
This PR fixes build messages and overall behavior
of our builds on travis and appveyor.
The probe package is no longer available in the Minio server
repo. This change just moves probe from the vendor directory to its
own dir under `pkg`.
This is a maintenance fix.
When a user needs to setup his own TLS configuration, he can put his
custom authority certificates in ~/.mc/certs/CAs/. These certificates will
be automatically loaded at startup and will be set to all HTTPS connections
