renamed @each to @for
don't coerce numbers into strings
don't visit parent nodes
scan root vars to detect params
refactored scopes and  got rid of $global
distinguish between basic and extended expressions
use peg.js instead of jison
support for dynamic tag names
array literals
arrays, object literals, members
add comments
Merge branch 'peg'
prepare for using react as runtime
Merge branch 'react'
refactor runtime lib
.