* New padding approach with separate horizontal and vertical padding
variables
* Improved sizing in large and small buttons and form controls
* Dropped the `.btn-mini` (since we have no `.input-mini` to match, and
holy fuck those were small buttons)
* Dropped the `.pagination-mini` as well because once again, to hell
with such small components
* Changed `@line-height-headings` to `@headings-line-height`
* Removed the `@headings-font-family` because it was honestly kind of
useless
* Instead of 20px as @line-height-base, use 1.5
* Update typographic scale for headings to use unitless as well--required some twerking of decimals a bit and some rounding
* Introduce new @line-height-computed value, which takes base font-size and multiplies it by 1.5, for use in padding and margin on components
* Refactor the .forms-horizontal code--much simpler now and built on the Bootstrap grid system instead
* Remove all the margins on form controls for simpler styling everywhere else--was overriding that way too often
* Drop .help-inline, but keep .help-block
* Drop the unused input grid class overrides
* Overhaul the form control sizing section to only show sizing via grid columns as parents, not as classes on inputs
* Restore the inline-form option
* Restore the bottom margin on form controls and make them block level instead of inline-block
* More misc docs cleanup for forms
* Nuke the commented out navbar forms code that's not currently needed
* Add a few more examples to the .navbar-form docs section
* Remove (for now at least) top padding on checkbox and radios
this is a resubmission of #5875, but now against branch 3.0.0-wip
does not exclude elements under a fieldset's legend
issue #6058 is a duplicate of #5605
* Deprecate .input-append and .input-prepend
* Use new, single base class for component, .input-group
* Deprecate .addon for .input-group-addon
* For compatibility with all buttons, require .input-group-btn to wrap buttons and button dropdowns
* Still need to reimplement with segmented button dropdowns, but that's dependent on a refactor of those first
