Better error logging for bad SSL connections

[tomcornall]

Log on a bad SSL cert looks like this ATM:

➜  zest-subscriptions lemonsync
🍋  Connecting to your store (https://wholejuice.com) ... 🍋

/usr/local/lib/node_modules/lemonsync/bin/lemonsync.js:487
        console.details('store', 'Connected with code', response.statusCode);
                                                                ^

TypeError: Cannot read property 'statusCode' of undefined
    at Request.callback [as _callback] (/usr/local/lib/node_modules/lemonsync/bin/lemonsync.js:487:65)
    at self.callback (/usr/local/lib/node_modules/lemonsync/node_modules/request/request.js:186:22)
    at emitOne (events.js:96:13)
    at Request.emit (events.js:188:7)
    at Request.onRequestError (/usr/local/lib/node_modules/lemonsync/node_modules/request/request.js:878:8)
    at emitOne (events.js:96:13)
    at ClientRequest.emit (events.js:188:7)
    at TLSSocket.socketErrorListener (_http_client.js:309:9)
    at emitOne (events.js:96:13)
    at TLSSocket.emit (events.js:188:7)

We should make this more useful, potentially by checking SSL on the url before connecting.