Refactoring DatabaseAdapter

[jsilvestre]

The code is very ugly and need at least to be commented properly.

[jsilvestre]

I am thinking more and more about it and maybe we should use an ORM like Doctrine...I haven't decided yet. Any thoughts? ping @lpdumas

[lpdumas]

I know that this is what we mostly use at work .. but that's it XD

I'll let you decide, i've no problem for using ORMs

[jsilvestre]

I will try it to see if it worth the rework!