Optimize seq,void 0.  Close #377.

    (x, void 0)    => void x
    (x, undefined) => void x
Mark `yield` as reserved word.  Close #375.
Conditional/call optimization

   foo ? bar(x) : bar(y)  ==>  bar(foo ? x : y)
Fix parens for property access -- (foo, bar)["baz"]
minor: exp["10"] => exp[10]
Fix #392
doh.
Support SpiderMonkey AST in UglifyJS.minify.  Fix #393.
Disable node 0.6 since the build fails consistently and it's not our fault.
Support @ngInject with `angular` compressor option.  Close #395.
Better process_for_angular before other statement reductions.  #395
Added support for sourcesContent property of source map
added hasOwnProperty check to avoid warnings
Unescape Unicode sequences in regexps when ascii_only is false.  #54
simplify
v2.4.9
Fix example
Don't unescape \x2f (slash) in regexps.  #54
v2.4.10
Don't unescape byte order marks in regexps