allow flat export of settings via php writer
support for flat settings in json writer
added template parameter to php settings writer
add template parameter to shell settings writer
Refactor vksprintf method to BaseFormatter and add

a bit more documentation to the settings writer classes.
Fix typo in shell template to make tests succeed
added more docs and first steps for next release
Remove xml.xsd and some cosmetic changes

The XML schema is not necessary anymore as it is not imported anymore in
the environaut.xsd file.
fix markdown type for docs/ link
fix markdown syntax for links
more markdown link syntax fixing :\
Fixed another markdown syntax typo
Merge pull request #13 from graste/non-nested-export

Flat exports and templates and some docs