Merge pull request #258 from rickcarlino/master

October 19th
Made reference to image file in 404 and 500 absolute
Merge pull request #260 from simonv3/master

Fix #256: Made reference to image file in 404 and 500 absolute
Link to Common Issues
Merge pull request #263 from warpling/master

Adding Link to Common Issues in README
Merge branch 'master' of github.com:FarmBot/OpenFarm