Close #94 and disables the file cache on affected PHP version

with this fix we provide a workaround for issue 94 which is caused by a
bug in PHP's unserialize/serialize implementation in all PHP versions
5.4.0 and 5.4.4. With this workaround we deactivate the file cache in
all affected PHP versions.
Utilized build framework version updated
Manifest for pear package updated.
Internal cache version bumped
Merge branch 'release-1.1.x' of github.com:pdepend/pdepend into release-1.1.x