Fix no space after "flip" for flipped fields in Scala FIRRTL, also make Scala FIRRTL emission match Stanza FIRRTL for bundles and regs

Add support for single-line and multi-line scoping to Scala FIRRTL preprocessing step. Also added with as scoping keyword

Move IntLit ANTLR lexer rule to before String lexer rule to ensure IntLit of form "h..." is lexed as IntLit instead of String

mucking up the chirrtl->firrtl transform. #56.

WIP Moving Scala FIRRTL to match spec 0.2.0. Not everything is implemented (notably stop, printf, mux, validif, ubits, sbits, readers, writers, and readwriters are incomplete)