Changed last-child to first-child
As noted by @jerem the first child will actually be the last shown
replace js scrollspy test for default behavior
add "focus" to focused btns with button plugin
Allow tabs to fade in if no initially active pane is present; fixes #13814
Add a few more cases to the visual test tab page
assign background to row of .table-striped

if background is not set on row, striping doesn't work properly in responsive tables where row and cells are set to  display: block.
removing redundant background declarations on TDs
Added @gray-base variable to make @gray-{shade} reference, also allows @gray-base to be modified with less#modifyVars and the vars to cascade
Fixed @gray-base value being once space short
Use mousedown instead of click for backdrop click detection; fixes #13816
Only close modal if escape was hit with keydown; fixes #13929
possible fix for #14013
Add collapsed default class to navbar-toggle
Add touch-action: manipulate to buttons
Mark the `remote` option of the Modal plugin as deprecated.

Follow-up to https://github.com/twbs/bootstrap/issues/13087#issuecomment-46563760
Closes #13087 as WONTFIX.
Closes #13597 as WONTFIX.
modal docs formatting tweak

[skip sauce]
Add Wall of Browser Bugs entry for #13892

Closes #13892.
[skip sauce]
Merge pull request #14037 from twbs/close-13892

Add Wall of Browser Bugs entry for #13892
Docs: add missing example code code for `kbd` after #13351.
Merge pull request #14047 from twbs/kbd

Docs: add missing example code code for `kbd` after #13351.