Add exclude folder option + doc
Update README.md
Fix configuration order
Merge remote-tracking branch 'pfn/sbt-0.12' into sbt-0.12
Merge remote-tracking branch 'kxbmap/fix-runtime-scope-deps' into sbt-0.12
Merge remote-tracking branch 'heralight/withExcludeDir' into sbt-0.12
Add 1.5.0 release notes
Set version 1.5.0
Set next development version
Update versions in readme
Use sbt-0.12.3
Update tested version in scripted tests
Set version 1.5.1
Set next development version
Update version in readme
Update release notes for 1.5.1
Support any compiler flag that does not need special configuration (#235)

Also, the ones having dedicated tag do not need to be added to general 
compilerOptions tag value.