Add better fromstring docs.
Update installation instructions re #4
Handle String() with no arguments.

Fix #91
Merge pull request #98 from ForbesLindesay/patch-1

Update installation instructions
Fix output for arrays containing undefined values.

1b6bcca7 was a first attempt at this. That commit made Uglify stop replacing
holes with undefined, but instead it started replacing undefined with
holes. This is slightly problematic, because there is a difference between a
hole and an undefined value. More problematically, it changed [1,undefined] to
[1,] which generally doesn't even parse as a hole (just as a trailing comma), so
it didn't even preserve the length of the array!

Instead, parse holes as their own special AST node which prints invisibly.
[AST_Hole] the print function can be a no-op.
Add --source-map-url option

Fix #100
Fix #47
Fix #105: property comparison to undefined is not always safe
Merge pull request #106 from gibson042/105

Fix #105: property comparison to undefined is not always safe
Merge pull request #94 from paulmillr/patch-1

Add better fromstring docs.
Fix end token for Assign nodes
v2.2.4
Wraps sourceMappingURL in a multiline comment. Fixes #108
Merge pull request #111 from mattrobenolt/safer-sourcemap

Wraps sourceMappingURL in a multiline comment. Fixes #108
Ugly hack to print comments before return/throw statements

Close #112
Fix handling of constants

Close #113
Fix parens for AST_New

Close #114
Fix parens for negative numbers

Close #115
Fix parens for NaN

Close #116
Give up evaluating (unary-prefix '-' 0)

Close #117

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    JS, WHY YOU SUCK SO BADLY? ;-(