readme: updated, added "who uses..."
Files with @ on start of filename are skipped
Added class Webgen - helper class in template ($webgen->currentFile,...)

$webgen->isLinkCurrent('homepage.texy');
$webgen->getCurrentFile(); // or only $webgen->currentFile
$webgen->createRelativeLink('articles/article-1.html');
Example moved into examples/basic
New config option 'onedir' (see command line parameter --onedir)
Webgen\Webgen: updated method isPathCurrent
Examples: added .gitignore