Update default syntax definitions

Added & updated following 6 syntax files as default syntax definitions. Moreover, added my name (1024jp) to credits.
The versions in the brackets are the same numbers as them in [my website](http://wolfrosch.com/works/goodies/coteditor_syntax).

__add__
- Apache (v1.1)
- Markdown (v1.0.2)
- Scala (v1.0)
- XML (v1.1)

__update__
- PHP (v2.2) : fix some bugs & support until PHP 5.5
- Python (v2.0.1) : fix some bugs & support until Python 3.3