Rebuild dotc if new *.scala files are found in `dotty/src`#615

Merged

DarkDimius merged 2 commits intoscala:masterfrom

dotty-staging:dotc-improve

May 27, 2015

Commits on May 27, 2015

Rebuild dotc if new *.scala files are found in `dotty/src`
DarkDimius
committed
Support rebuilding tests in dotc, be smart about sbt incremental compilation.
DarkDimius
committed