Udates for upstream dependencies

- latest Assetic, some fixes and example in codex
- move main dependencies to a separate package, xoops/base-requires, allowing core dependencies to be managed separately from any installed modules.
Updates for Doctrine/DBAL 2.5.0

- QueryBuilder now supports insert, so adding insertPrefix
- alias in from() now optional, adjusting fromPrefix to match
Merge pull request #224 from geekwright/composer-refresh

Udates for upstream dependencies