Add feature: Filter tags based on their parameter#45

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jonasdiemer wants to merge 3 commits intodavidoc:masterfrom jonasdiemer:master

Commits on Jul 13, 2013

Added a tag range filter, including mapping and documentation.
jonasdiemer
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When archiving, only consider project lines ENDING with a colon.
jonasdiemer
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Commits on Jul 16, 2013

Added shortcut to show due and overdue tasks. Updated README
jonasdiemer
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