Added migrated HighFormCheck to Scala FIRRTL, changes to IR and Utils for getting info for error reporting in new pass/check.

Adding ScalaTest for unit testing of Scala FIRRTL. Added a few basic tests for the Parser. Added custom Parser exceptions for better error reporting and checking. Fixed bug in grammar not allowing most keywords as Ids

Restructure passes to be new subpackage with more modular design, add new structures Compiler and Emitter, deprecate old Passes object, update Driver to use new constructs

Fix serialize bugs: WSub(Field|Index|Access) printing extraneous w, module not printing newline before ports

Add project/build.properties with requirement of sbt 0.13.6, this version is required for sbt assembly to work

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