added variables and methods for sidebar navigation and seo#18

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mfa wants to merge 3 commits intojarus:masterfrom mfa:master

+28-3

Commits on Jan 12, 2013

added month_newest() to archive, for linking to newest month. addional added fullarchive variable for navigation purposes
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added tags variable for navigation
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added command for generating tags as komma seperated list for meta keywords
mfa
committed