Add Ubuntu 12.04.3-i386 template

Based on ubuntu-13.04-server-amd64 template commit: 5344f0e
https://github.com/jedi4ever/veewee/commit/5344f0ed2a40938bb2dec406ec0461b5b726ede8

changed default memory, os_type_id, and appropriate iso references (plus MD5) to point to 12.04.3-server-i386
and tested by building locally.

I ran (what I think are the validation test:
veewee vbox validate '1204.3i386'
Checking user - OK
Checking sudo - OK
Checking ruby - OK
Checking gem - OK
Checking chef - OK
Checking puppet - OK
Checking shared folder - OK