1.0.0 Release

This is the first major release, from 1.0.0 forward semver will be followed.

Breaking Changes from 0.13

• Promises were introduced to better deal with markdown conversion, and now PDFExporter .createJob returns a promise instead of a job object. You should update your code accordingly,
  for example:

exporter.createJob(source, target, options).then( job => {
    job.on('job-complete', (r) => {
            console.log('pdf files:', r.results)
            // Process the PDF file(s) here
        })
        job.render()
    })  

Fixes

• Issue #129 - Markdown generation was
  broken and PDF files had suffixes at the end of the filename