- add optional form for list props: ['optionalField?']
- accept undefined values for optional props
- allow declaring props with only boolean true
- throw error if extra prop is given to component
closes#223
This commit adds a static key 'dev' on QWeb (which acts as a central
point of access in owl internal code), and a 'mode' key on the value
exported by owl to let external code manipulate it.
closes#117
Géry Debongnie