Cleaning up and updating the roadmap.md (dotnet#282)

* Cleaning up and updating the roadmap.md

Merge pull request dotnet#259 from leecow/master

Added temp directory checking and clean up

Merge pull request dotnet#152 from dotnet/leecow-master

Rename release notes

Merge pull request dotnet#80 from leecow/master

Fixed broken links

Update README.md