Add option to limit memory available to external commands
Limit memory available to wvText, which calls elinks
Use ruby 1.8.7 bindings for backward compatibility
Re-add commonlib rake files
Merge branch 'external-command-memory-limit' of ssh://git.mysociety.org/data/git/public/alaveteli into external-command-memory-limit
Update commonlib to get memory allocation flag for ExternalCommand
Merge branch 'external-command-memory-limit' into hotfix/0.9.0.3
Latest version of commonlib - I don't think the require of 'spec/rake/spectask' is needed, and causes problems in production.
Merge remote-tracking branch 'origin/hotfix/0.9.0.3'