added a way to exclude some points from the map bounds#9

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tra wants to merge 5 commits intovigetlabs:masterfrom

Commits on Jul 3, 2010

show the whole world if no data points are available
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Commits on Jul 6, 2010

don't cache metadata so that dynamically changed place data will get picked up
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Commits on Feb 13, 2011

Merge remote branch 'upstream/master'
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Commits on Feb 14, 2011

fixed documentation of default value for metadata_options
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Commits on Feb 19, 2011

added the 'bounded' attribute to the data object so that a place can be excluded from the bounds calculation
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