fix undefined variables
merge.sh must have UNIX line endings, otherwise it can't be executed
Merge pull request #12 from steinsag/fix_fill

fix issue: https://github.com/t0k4rt/phpqrcode/issues/9
Merge pull request #13 from steinsag/unix

merge.sh must have UNIX line endings, otherwise it can't be executed
Merge pull request #10 from shostelet/master

fix some undefined variables
- allow embedding of SVG file directly into HTML by returning it as a string only
- fix doctype of SVG