Update README.md

removed typos, improved syntax and changed some expressions
Fix in the dot_score calculation, was causing wrong start points to be selected.
Remove build clipper on clean.
Flags for OpenBSD
Merge pull request #141 from qbit/master

Add flags for OpenBSD
Fix BFB support.
Merge branch 'master' of github.com:Ultimaker/CuraEngine
Fix #144 for dos format files.
Improve skirt handling with support material
Merge https://github.com/Ultimaker/CuraEngine