Tags: n054/minify

Add gzip method

Fixed matthiasmullie#47

Don't convert standalone arrays

"return" looks like it could be a variable of which ['x']
is a key. I've improved the code to also check for keywords.
If whatever preceeds it is one of the keywords, don't convert.

Fixes issue matthiasmullie#44

Empty strings should be extracted after all

The extraction routine needs to skip that match.
However, it doesn't need a placeholder value.

Fix recursive relative path resolving

I had to split the action of minification into a separate
method because recursively importing files requires them
to also be minified, and I don't want that one to write
to a file.

Make comments-regex quantifiers posessive

Was prone to hit PREG_BACKTRACK_LIMIT_ERROR.
Should also improve performance.

Fixes matthiasmullie#42

Don't strip double semicolons before )

Fixes matthiasmullie#40

Add a newline between scripts being joined

Fixes issue matthiasmullie#35

Improve string extraction

Test to check if ending string delimiter is escaped was flawed.

Don't strip whitespace after ++ or --

In PHP5.3, closures have no notion of where they're run at

So static:: (just like $this) won't work either.