Auto merge of #3417 - alexcrichton:fix-svn, r=brson
Auto merge of #3417 - alexcrichton:fix-svn, r=brson

Ignore dot dirs in directory sources

Looks like they'll conflict with a VCS, so let's just skip them like we do in
directory traversal elsewhere.

Closes #3414

sbeckeriv/cargo,nipunn1313/cargo,achanda/cargo,rustyhorde/cargo,rustyhorde/cargo,tsurai/cargo,tsurai/cargo,durka/cargo,durka/cargo,rust-lang/cargo,vojtechkral/cargo,rust-lang/cargo,sbeckeriv/cargo,rust-lang/cargo,sbeckeriv/cargo,nipunn1313/cargo,eminence/cargo,durka/cargo,durka/cargo,eminence/cargo,tshepang/cargo,tshepang/cargo,achanda/cargo,eminence/cargo,tshepang/cargo,rustyhorde/cargo,vojtechkral/cargo,eminence/cargo,nipunn1313/cargo,vojtechkral/cargo,sbeckeriv/cargo,tsurai/cargo,tsurai/cargo,tsurai/cargo,achanda/cargo,achanda/cargo,vojtechkral/cargo,rust-lang/cargo,rustyhorde/cargo,tshepang/cargo,nipunn1313/cargo