update travis.yml to test with php 5.5 and more cake versions

Signed-off-by: Joshua Paling <joshua.paling@gmail.com>
adjust database setup in travis.yml

Tests were failing on Travis only, due to a) database collation not being set, and b) there being no $default database config in the travis.yml file

Signed-off-by: Joshua Paling <joshua.paling@gmail.com>
Merge pull request #151 from joshuapaling/feature/migrations-from-cli

Tweak travis file to fix failing tests