Remove most of gittip.db (except elsewhere).

Ref #1528.
Finish removing `gittip.db` global.
Merge pull request #1734 from gittip/db-global

Remove `gittip.db` global
fix chart width issues
allow charts to have sub-pixel widths

By removing this restriction, our bar graphs can now stretch to fill
all of the available space instead of wasting the space that wasn't
evenly divisible into whole pixels for each bar.

Not all browsers support sub-pixel rendering, so the code reverts back
to the previous behavior instead of rendering an ugly graph to the user.
fully responsive graphs :heart:

By specifying graph bar widths in percentages, we get a graph that
resizes when you resize your browser.

This is only enabled if the browser in question supports subpixel
rendering, so it's unlikely to break our graphs in browsers that don't
support percentages and `calc()`.
update fake data generator

Now it generates user statements that are long enough to trigger the
two-column layout, and generates enough transfers that there's
sufficient data in the user receipts graph.

I lowered the number of total users since our fake transactions are
random, so it's more likely for a given user to have a good number of
receipts.
Bump version to 10.1.48
Bump version to 10.1.48-dev
fix the gittip.db removal
more fixes for the gittip.db removal
one more fix for the gittip.db removal
fix JSON simplates
Bump version to 10.1.49
Bump version to 10.1.49-dev
add inline docs for subpixel rendering feature detection
Merge pull request #1735 from seanlinsley/ui/responsive_graphs

Responsive graphs
Bump version to 10.1.50
Bump version to 10.1.50-dev