PR's to be included,

• Faster compilation of inductive implicits: Faster compilation of inductive implicits. scala/scala#5649 (@milessabin)

• Minimal kind-polymorphism: Providing minimalistic & controlled kind-polymorphism [ci: last-only] scala/scala#5538 (@mandubian)

• Add flags -Ysysdef and -Ypredef to configure root imports: Add flags -Ysysdef and -Ypredef to configure root imports [ci: last-only] scala/scala#5350 (@andyscott)

• Infix type printing (SI-4700): SI-4700 Types with symbolic names print in infix by default scala/scala#5589 (@allisonhb)

• Trailing commas (SIP-27): SI-4986 Allow trailing commas before newlines scala/scala#5245 (@dwijnand)

• Literal types (SIP-23): SIP-23 Implementation of literal types scala/scala#5310 (@milessabin)

• Exhaustivity of extractors, guards, and unsealed traits (SI-5365): SI-5365 Exhaustivity of extractors, guards, and unsealed traits. scala/scala#5617 (@sellout)