fixing build status image for travis ci

Now retina ready
Use SVG for the Travis badge in the README
Merge pull request #44 from MaxGabriel/patch-1

Use SVG for the Travis badge in the README
Merge pull request #43 from haaakon/patch-1

fixing build status image for travis ci
Update Dvorak check

For issue 45
Merge pull request #4 from onevcat/master

同步到最新