Extract method works properly with code indented more than one level

[tomphp]

Extract method was messing up the extracted method if the code being extracted was indented more than 4 spaces.

Also the method call to the extracted method was not indented correctly.

This PR fixes both these issues.

Unit tests & acceptance tests are included.

PS: For some reason 2 scenarios are failing the the Fix Class Names feature but there were failing before I started working so I'm assuming that they either are currently broken in the repo or something in my environment?

[beberlei]

Is the reset necessary? It leaks technical data into the domain.

[tomphp]

I can replace it with $line[0] if you prefer? I suppose under these circumstances the first index isn't going to be anything other than 0

[tomphp]

@beberlei I have replaced the reset with $lines[0]. On further thinking this could cause a problem if the first line is a blank line, however I think first line is better than minWhitespace() since that's the initial indentation of the block.

In reality I think all the whitespace detection should be refactored into a WhitespaceDetector class, if you are happy for me to do that I'll have a go at that a bit later on.

[tomphp]

Rebased, fixed to work with new patch generation and squashed :)