Manually install en_GB collations
Manually install en_GB collations

See
https://github.com/mysociety/alaveteli/pull/2889#issuecomment-164729125

Travis CI moved us on to their new platform for Legacy Precise builds,
which didn't have the collations installed.

This generates en_GB locales for the system (using `--no-archive`
http://git.io/vun4e) and later manually adds the collations to the
foi_test database.

andreicristianpetcu/alaveteli,Br3nda/alaveteli,Br3nda/alaveteli,Br3nda/alaveteli,Br3nda/alaveteli,Br3nda/alaveteli,andreicristianpetcu/alaveteli_old,andreicristianpetcu/alaveteli_old,andreicristianpetcu/alaveteli,nzherald/alaveteli,nzherald/alaveteli,andreicristianpetcu/alaveteli_old,nzherald/alaveteli,andreicristianpetcu/alaveteli_old,andreicristianpetcu/alaveteli,nzherald/alaveteli,andreicristianpetcu/alaveteli,andreicristianpetcu/alaveteli_old,nzherald/alaveteli,andreicristianpetcu/alaveteli