[+BUGFIX] Directory Iteration should skip hidden directories
[+BUGFIX] Directory Iteration should skip hidden directories

The problem manifests if one uses SVN, which adds .svn
directories into places which are monitored by file monitoring.

Then, also files inside the .svn directories are monitored;
which crashes the cache system later, with an exception:
1233057359: "%CLASS%F3_MyPackage_.svn_text-base_Package" 
is not a valid tag for a cache entry.

Bugfix: Just skip over directories if they start with ".",
which is consistent as we do this with files as well.

Change-Id: I0d4c1ed601a7d55fc36c136b3f8fa3c246d0de7d
Original-Commit-Hash: e2e53f6a5da31be91b0e3123f91d44dab40b5f23

dfeyer/flow-development-collection,robertlemke/flow-development-collection,robertlemke/flow-development-collection,gerhard-boden/flow-development-collection,dlubitz/flow-development-collection,dfeyer/flow-development-collection,bwaidelich/flow-development-collection,dlubitz/flow-development-collection,dfeyer/flow-development-collection,neos/flow-development-collection,chewbakartik/flow-development-collection,bwaidelich/flow-development-collection,mkeitsch/flow-development-collection,neos/flow-development-collection,kitsunet/flow-development-collection,bwaidelich/flow-development-collection,daniellienert/flow-development-collection,fcool/flow-development-collection,neos/flow-development-collection,robertlemke/flow-development-collection,gerhard-boden/flow-development-collection,kdambekalns/flow-development-collection,gerhard-boden/flow-development-collection,kdambekalns/flow-development-collection,chewbakartik/flow-development-collection,fcool/flow-development-collection,aertmann/flow-development-collection,aertmann/flow-development-collection,aertmann/flow-development-collection,albe/flow-development-collection,fcool/flow-development-collection,robertlemke/flow-development-collection,dlubitz/flow-development-collection,albe/flow-development-collection,mkeitsch/flow-development-collection,neos/flow-development-collection,dfeyer/flow-development-collection,kdambekalns/flow-development-collection,kdambekalns/flow-development-collection,fcool/flow-development-collection,daniellienert/flow-development-collection,daniellienert/flow-development-collection,chewbakartik/flow-development-collection,mkeitsch/flow-development-collection,kitsunet/flow-development-collection,albe/flow-development-collection,kitsunet/flow-development-collection