Conversions where the job fails because of no disk space get registered as having succeeded

[NathanSkene]

Hey Akos,

Very minor bug here but thought I should flag it anyway.

Ran out of disk space while doing the conversion.

Failed to convert note: # Golgi
 Error: ENOSPC: no space left on device, open '/Users/natske/Applications/yarle/./out/simpleNotes/My Notes2/201107121226 golgi.md'
    at Object.openSync (fs.js:462:3)
    at Object.writeFileSync (fs.js:1362:35)
    at Object.exports.writeMdFile (/Users/natske/Applications/yarle/dist/utils/file-utils.js:7:12)
    at Object.exports.processNode (/Users/natske/Applications/yarle/dist/process-node.js:30:22)
    at EventEmitter.<anonymous> (/Users/natske/Applications/yarle/dist/yarle.js:31:28)
    at EventEmitter.emit (events.js:315:20)
    at SAXStream.<anonymous> (/Users/natske/Applications/yarle/node_modules/xml-flow/lib/xml-flow.js:142:15)
    at SAXStream.emit (events.js:315:20)
    at SAXParser.me._parser.<computed> [as onclosetag] (/Users/natske/Applications/yarle/node_modules/sax/lib/sax.js:258:17)
    at emit (/Users/natske/Applications/yarle/node_modules/sax/lib/sax.js:624:35) {
  errno: -28,
  syscall: 'open',
  code: 'ENOSPC',
  path: '/Users/natske/Applications/yarle/./out/simpleNotes/My Notes2/201107121226 golgi.md'
}
Note # Golgi
 converted successfully.
Notes processed: 3618
Conversion finished: 3618 succeeded, 0 failed

Note that in the final statement it says that '0 failed' even though many hundreds didn't write because there was no disk space available.