init repo
Fixes some gotchas.

DynarchLIB (660K) now passes parsing in 440ms (about 30% slower than the
parser in UglifyJS v1).
added small node test script
WIP
WIP
codegen and dropped the useless walker
lots'o'fixes in the output routines; still a looong way to go.
code generator finally seems to work properly
fix one more glitch
added some comments about the rules governing parens
don't output both space and semicolon when beautify=false
big speed improvement (observable when beautify = false)

who would have thought that str.charAt(str.length - 1) is not a constant,
instant operation?  seems to get slower and slower as the string grows.

0.6s vs. 3s
minor whitespace issues
some fixes (need testing) in AST_If codegen
simple visitor API and code to figure out scope and references
doc (WIP)
added mangler and other stuff
more fixes:

- added walker for AST_ObjectProperty
- handle redefinitions properly (only mangle one symbol, make them all point
  to a single definition)

DynarchLIB seems to run fine after mangling + compressed output.
warn about unreferenced symbols
handle labels properly

(they can't be handled the same way as variables in a scope)