travis: cache complete .sbt directory
travis: cache complete .sbt directory

jastice/intellij-scala,JetBrains/intellij-scala,triplequote/intellij-scala,triplequote/intellij-scala,jastice/intellij-scala,JetBrains/intellij-scala,triplequote/intellij-scala,jastice/intellij-scala,jastice/intellij-scala