bugfix #242
Merge pull request #371 from colorhook/master

bugfix #242
minor
Add option to adjust the src/target line in the source map
v2.4.8
Take out all comments from an AST_Exit's value

Fix #372
Better fix for comments in AST_Exit

Close #374
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