FAQ page could use some updating

[shoyer]

Along the same lines as #1282, we haven't done much updating for frequently asked questions -- it's mostly still the original handful of FAQ entries I wrote in the first version of the docs.

Topics worth addressing:

• How xarray handles missing values
• File formats -- how can I read format X in xarray? (Maybe we should make a table with links to other packages?)

(please add suggestions for this list!)

StackOverflow may be a helpful reference here: http://stackoverflow.com/questions/tagged/python-xarray?sort=votes&pageSize=50

[stale]

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