As part of the librarization project, we are planning on taking the
CSSJanus library that is currently in includes/lib/ and bringing it in
with composer. However, it requires PHP >=5.3.3 in its composer.json.
Krinkle has stated that is due to the fact that it has only been
tested on 5.3.3 and higher, and it's also what travis-ci provides.
After doing some research, it appears that we would be dropping
support for Ubuntu 10.04LTS, which has security support until April
2015. MediaWiki 1.25.0 is expected to be released in May 2015.
Does anyone have any objections to dropping 5.3.2 support? I've uploaded
 that actually increments the required version number.