Support optgroup for select boxes

Add support for optgroup in select boxes including showing labels and disabeling a whole group.

assigned to @cedricwilleken

added 6 commits

• 85c9b381...7e5d8041 - 5 commits from branch master
• 7f634ad1 - Support optgroup for select boxes

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added 1 commit

• 27c0ae17 - Bump version for chihuahui

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added 1 commit

• 7bd1fb5f - Bump version for chihuahui

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added 1 commit

• 3a12bf84 - Make sure that whole dropdown is correct background

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added 1 commit

• 6e769f21 - Make sure that whole dropdown is correct background

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added 1 commit

• d72009b8 - Make optgroup auto detectable

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added 1 commit

• 09b62082 - Add variant attribute to selectbox

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mentioned in commit 7d84a879

merged

unassigned @cedricwilleken