App dependencies php version

First app dependencies just arrived: minimum and maximum php versions and supported databases:

```xml
	<dependencies>
		<php>
			<min-version>5.4</min-version>
			<max-version>5.4</max-version>
		</php>
		<database>sqlite</database>
		<database>mysql</database>
	</dependencies>

> The question I think is: do we want to have generic database settings like all databases must support common feature X.

I don't think this is the level of detail we want to dive in - testing the database version already adds some fun.

I'll kill the nesting then - THX