Added vim .swp files to the ignore list.
Added vim .swp files to the ignore list.

proofpoint/platform,daququ/airlift,gwittel/platform,johngmyers/airlift,electrum/airlift,johngmyers/platform-rack,electrum/airlift,haozhun/airlift,airlift/airlift,dain/airlift,haozhun/airlift,johngmyers/platform-rack,proofpoint/platform,gwittel/platform,mono-plane/airlift,johngmyers/airlift,zhenyuy-fb/airlift,daququ/airlift,zhenyuy-fb/airlift,daququ/airlift,cberner/airlift,airlift/airlift,haozhun/airlift,mono-plane/airlift,johngmyers/platform,johngmyers/platform-rack,martint/airlift,airlift/airlift-rack,erichwang/airlift,airlift/airlift,zhenyuy-fb/airlift,martint/airlift,johngmyers/platform-rack,electrum/airlift,erichwang/airlift,johngmyers/platform-rack,dain/airlift,airlift/airlift,cberner/airlift,airlift/airlift-rack,martint/airlift,gwittel/platform,johngmyers/airlift,electrum/airlift,zhenyuy-fb/airlift,cberner/airlift,johngmyers/platform-rack,cberner/airlift,erichwang/airlift,johngmyers/platform,dain/airlift,haozhun/airlift,johngmyers/airlift,mono-plane/airlift,proofpoint/platform,johngmyers/platform,daququ/airlift,mono-plane/airlift,dain/airlift