Implement --exclude-if-present#142

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wavexx wants to merge 2 commits intojborg:masterfrom

wavexx:exclude_if_present

Commits on Dec 14, 2014

Implement --exclude-if-present
wavexx
committed

Commits on Dec 15, 2014

Implement --keep-tag-files to preserve directory roots/tag-files
wavexx
committed