Fixing typo according to li3_quality.

- fixing typo according to li3_quality.
- string comparison are done when possible with strict opérator (i.e ===  / !==)
- disable li3_qualtity in travis

Would be fine to reenable li3_quality only when it'll be able to pass all the core (this way PR won't need to be contaminated with typos stuff).

PS: li3_quality should pass (or almost pass imo) on this PR but currenlty it's not the case.