GitMiner is not resilient to IOExceptions on unreliable connections

[pridkett]

GitMiner checks for most issues, but apparently there are a few that have slipped through the cracks. For example:

11:00:08.618 [main] ERROR n.w.r.github.v3.RepositoryMinerV3 - IOException in getRepositories: mountriv99
javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.6.0_24]

More analysis should be done surrounding IOExceptions to parse out the root cause and retry for SSLHandshakeExceptions.