Made PATTERN_MATCH_ID_METHOD more flexible

[4alexandr]

PATTERN_MATCH_ID_METHOD match any valid function declaration, example:
function getId(){return$this->id;}

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[Ocramius]

@4alexandr requires test case.

[4alexandr]

@Ocramius Sorry, i don't know, how to write tests for this change. I can test this only manually.
Old pattern can match

    public function getId()
    {
        return $this->id;
    }

but can't

    public function getId(){
        return $this->id;
    }

In commit i change non-required whitespaces detection in function declaration.

[Ocramius]

@4alexandr look at existing tests for the proxy generator ;-)

[Ocramius]

Is also fixed by something like doctrine/orm#1241 (linking for reference - this partial fix is fine for now)

[Ocramius]

Related (not blocking) doctrine/orm#1241

[Ocramius]

Checked again, and writing a test case for this is a huge annoyance for little benefit. Merging as-is.