improve exception msg when asset path type is not found
when generating cached setup always reset to current kwf path

before this change KWF_PATH was cached 'forever' until cache/setup3.php was deleted manually
update script for 3.8 update

- change Ext to Ext2
- update bootstrap to use vendor/
- update .gitignore
- create default composer.json
remove checkBranch funktionality

not needed anymore with composer
support vendors with multiple, custom provider classes

for support of ext4 in own package
Loader: allow other package to define eg. Kwf_Xxx and not use Kwf_ namespace in that case
zf 1.12 compatibility: add head action

TODO: do something useful in there