Increase memory allocation for development VM
Increase memory allocation for development VM

Functional tests have recently been failing due to "out of memory"
errors. My theory is that this is due to the new release of Firefox,
which came out two days ago (and usually takes a day or so to make it
into the mainline repos) using more memory than the previous release.
Timelines match up, although I haven't done any further testing to prove
this.

Nice side effect: increasing the amount of available memory makes
Firefox run faster, which makes the functional tests run faster. Also
appears to eliminate various intermittent errors from the functional
tests, such as the "empty status line" error from Selenium and the
TypeError from python-gnupg. This makes sense!

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