Add better fromstring docs.

Fix #105: property comparison to undefined is not always safe

Fix #100
Fix #47

1b6bcca7 was a first attempt at this. That commit made Uglify stop replacing
holes with undefine...

Update installation instructions

Fix #91

Compressor options use underscores rather than hyphens

Close #57
Close #86
Close #33

Add a --version option

close #83

[not sure I'm happy about this fix]

Reference mishoo/UglifyJS#478

Close #74

(need to force a semicolon for the empty body of an `if`)

Close #72

fix #60.

It breaks usage like this:

echo '...code...' | uglifyjs

This reverts commit e48802ad291fae...

Fix #59

Fixed reading from STDIN

otherwise we change the meaning of eval from global to lexical.

Usage: uglifyjs2 -b "beautify=0,preserve_line=1" /path/to/js

ref #46

ref. mishoo/UglifyJS#441

ref. #43

close #44

Convert x.toString() to ""+x instead of x+""

In some places this can save one byte in whitespace, e.g. after return.
Example:

function f(arg...

close #40

close #36, #38

for(...; x; ...) if (y) break; → for(...; x&&!y; ...);

similarly for `while` and some combi...

we do need parens here: `new (foo.bar().baz)`, but not here: `new foo.bar.baz`

AST_Accessor will represent the function for a setter or getter. Since they
are not mangleable,...

refs #35

fix #35

fix #34

(for more fair comparison to Closure compiler)

(since the source-map module no longer uses require.js)

refs #9

for `==` or `!=` against a constant, prefer to display the constant first.
should help a bit aft...

close #28

to mitigate the `__proto__` issue

related to #30

#kendo

since it has the potential to break code, let's keep it disabled by default

only try negating the expression if the operator is `!`

#kendo

(opera can't parse it)

close #25

close #24

(it was assumed that the first `return` always contains a value)

close #22

ref #9, close #20

Allow to specify sourceRoot in minify

function f(x, y) {
var g = function() { return h() };
var h = function() { r...

code, instead of file names, as first argument).

close #17

(unlikely to help for hand-written code)