Correctly display errors in configure-pg-env.sh.

* Print errors in configure-pg-env.sh to STDERR instead of STDOUT.
* Don't run `export` in recreate-schema.sh until after
  configure-pg-env.sh is successfully ran, to avoid the case where
  it would run `export` without any arguments. `set -e` ensures it
  won't run the `export $ENV` line if configure-pg-env.sh fails.
Merge pull request #1748 from duckinator/build-system-fixes

Correctly display errors in configure-pg-env.sh.
Fix BountySource regression from #1734
fix subpixel rending problems, for good this time

by removing the absolute positioning of individual bars and instead
floating left, we make the browser's job much easier
re-institute a two column layout for /about/charts.html
chart JS cleanup
get the X axis working propery
Merge pull request #1760 from seanlinsley/bugfix/1734/bountysource

Fix BountySource regression from #1734
Take out X axis ticks

These were added without discussion.
Clean up whitespace
Fix regression in x axis labels

Weeks are numbered starting with one, not zero.
Correct a comment

We don't necessarily show a chart for every variable available, only for
the ones for which a container exists on the page.
Merge pull request #1761 from gittip/chart-fixes

Chart fixes
Bump version to 10.1.52
Bump version to 10.1.52-dev
charts: use percentage instead of calc()

in order to support IE 8 & iOS 6 Safari w/out a vendor prefix

also removes old CSS that @whit537 forgot about :)
Merge pull request #1766 from seanlinsley/ui/responsive_graphs_take_three

Charts: use percentage instead of calc()
Bump version to 10.1.53
Bump version to 10.1.53-dev
use python libsass library for SASS compilation