imouto-devel/ansible/group_vars: Change sphinx_version to 32-bit

The variable sphinx_version contained 64-bit version of sphinxsearch.
The commit changes it to a 32-bit version to install it in a 32-bit
machine.
imouto-devel/Vagrantfile: Change the box to 32-bit version

The commit changes the Vagrantfile to fetch and initiate a 32-bit
box instead of 64-bit one.
Merge branch 'master' of https://github.com/Tatoeba/admin