prep for 0.1.2 release

- update history
- bump versions from dev/SNAPSHOT
fix up maven release notes
bump version to 0.1.3
extract isMacro helper in typer
add helper for expanding and replacing macros
Merge branch 'master' of https://github.com/mirah/mirah
Merge branch 'master' into new_bootstrap

Conflicts:
	src/org/mirah/tool/mirahc.mirah
	src/org/mirah/typer/typer.mirah