Update to v3.0.0.rc.2
Add span wrappers around label and input contents.

- `label.control-label` is now surrounded with `span.form-label`
- `input_content` (f.e. all data inputs & hint row) is now surrounded with `span.form-wrapper`

You can style them to f.e. make your form look more like `.form-horizontal`.
Remove hacks in Timeish inputs.

- puts all the :year, :month, and other columns into `div.row`.
- also fixes the grid column styling - date input fragments should fill in whole 12 grid units (see: `Timeish::FRAGMENT_CLASSES`, `DateSelectInput::FRAGMENT_CLASSES`, `TimeSelectInput::FRAGMENT_CLASSES`