Add Select::sum()
Add Select::sum(). Attr to column
fix wrong type checking
Add protection around rightHandSide conditions for compound PK
Use excluded and included keys for attributes() fn
Change _update() to handle correctly compound PK
Add options param to load()
add return to load function
Add Ã_sub suffix for EXISTS conditions
Use current node depth to compute next node's
Merge branch 'master' of github.com:Lebugg/SimpleAR
Add Condition::setTableAlias method
Add filter and group_by options.
Fix bug when using DB::expr().
Correctly update id of inserted models with composite PK
Allows insert with PK.
Stuffé
Bump version number to 1.1
Merge branch 'develop'

Conflicts:
	SimpleAR.php
	lib/Orm/Model.php
	lib/Query/Arborescence.php
	lib/Query/Condition.php
	lib/Query/Condition/ConditionGroup.php
	lib/Query/Condition/Exists.php
	lib/Query/Count.php
	lib/Query/Option/Filter.php
	lib/Query/Option/Has.php
	lib/Query/Select.php
	tests/ModelTest.php
Merge branch 'release-1.2'