#3 fix file order to list plain files ahead of subdirectories

[Murali Krishnan]

Currently, the scan file list is purely alphabetical. Thus giving:
acquire/general/pom.xml
acquire/pom.xml
acquire/spiders/base/pom.xml
acquire/spiders/pom.xml

However, we want each base directory to search its plain files before searching inside subdirectories. So the order should be:
acquire/pom.xml
acquire/general/pom.xml
acquire/spiders/pom.xml
acquire/spiders/base/pom.xml