Update scrollspy docs to more clearly indicate usage

BS3 commits: 7d456aef76e0e9353269feb71aef8b7ae61f2c1d
improve affix docs with step-by-step walk through of plugin behavior and required CSS

BS3 commits: 1e6c95cd5d04ae5750d46195d652e21e9a461647
use xs grid classes in regular thumbnail docs

BS3 commits: 61c641ea05c317e06bb3b9df0d9956abffc32e7e
Easily copyable classes

BS3 commits: f7b7cc3443da0a228fdfb4d5c02f25427f978bb1
Don't use .img-thumbnail as a mixin for .thumbnail to avoid dupe and unnecessary styles

BS3 commits: e4848286c86af39c5a30c845748fdc46de8b8dd5
Better documentation for validation states

BS3 commits: e6eb798178529cf58fab3f33446c0170bae7bdea
Speedier jQuery and Twitter widgets.js

BS3 commits: a15a6dfa9642d1f572d3914a2d788c8815842ec7
fixing offcanvas example for chrome

BS3 commits: 143427b8ae8c9a2b513c34a2656228ff7347bb3b
Add 'in' to complete thought

BS3 commits: 95487f75d1e8cf5da8af098bf13f1c3f5b13be36
Alternate fix for 11303: add link to site in banner and remove @mdo and @fat usernames from it

BS3 commits: a7a9dcaeb2231b2580cf79fcee7d777b98ac24d8
Fixes 11468: Prevent default gradient on in Firefox for Android

BS3 commits: 09cd5289ab540486a9c601e79860b34a2fe1873c
Fixes issue 11098 -- Button documentation.

BS3 commits: 0d81c4e33993e6d8c2e83f80a0030ae6453c60e5
Corrected color contrast to WCAG 2.0 AA (Accessibility Tweak) - Forms and Alerts

BS3 commits: 938d40fc20d2a843fd15f3af50a51427b53b36ce
Alternate fix for 11303: add link to site in banner and remove @mdo and @fat usernames from it. grunt to get dist files. Add missing data namespace for dropdown

BS3 commits: a7a9dcaeb2231b2580cf79fcee7d777b98ac24d8,
9f0da54856f6a4111b4d9f8780db2b2257ef90b1,
a06610a030ae059f99212e775efa33a435acbbc3
Merge branch 'pr/11493'

BS3 commits: 867422852130111e886df94ab0e5cd412ae2bafc
include jspm package configuration

BS3 commits: 40f86af16a9b48fa55907ac6b4c9116238e52fd5
Simplify table state styles

BS3 commits: 080aa7f5c8557b232005cb947df51968d4629656
Don't use .img-thumbnail as a mixin for .thumbnail to avoid dupe and unnecessary styles. Alternate fix for 11303: add link to site in banner and remove @mdo and @fat usernames from it. Fixes 11468: Prevent default gradient on in Firefox for Android. Fixes 11390: Add max-width to containers within jumbotrons to avoid horizontal scrollbar. Fixes 11425: Use margin instead of padding on .modal-dialog to enable click-thru to .modal-backdrop. Corrected color contrast to WCAG 2.0 AA (Accessibility Tweak) - Forms and Alerts. Merge branch 'pr/11493’. grunt to get dist files. Simplify table state styles

BS3 commits: e4848286c86af39c5a30c845748fdc46de8b8dd5,
a7a9dcaeb2231b2580cf79fcee7d777b98ac24d8,
09cd5289ab540486a9c601e79860b34a2fe1873c,
a4c54b5e5d948e9ec7cdd22bc0efa2241d2605c6,
bf9f39270c7c6d50b0355a0b1a5e470c0820af07,
938d40fc20d2a843fd15f3af50a51427b53b36ce,
867422852130111e886df94ab0e5cd412ae2bafc,
9f0da54856f6a4111b4d9f8780db2b2257ef90b1,
080aa7f5c8557b232005cb947df51968d4629656
Don't use .img-thumbnail as a mixin for .thumbnail to avoid dupe and unnecessary styles. Alternate fix for 11303: add link to site in banner and remove @mdo and @fat usernames from it. Fixes 11468: Prevent default gradient on in Firefox for Android. Corrected color contrast to WCAG 2.0 AA (Accessibility Tweak) - Forms and Alerts. Simplify table state styles

BS3 commits: e4848286c86af39c5a30c845748fdc46de8b8dd5,
a7a9dcaeb2231b2580cf79fcee7d777b98ac24d8,
09cd5289ab540486a9c601e79860b34a2fe1873c,
938d40fc20d2a843fd15f3af50a51427b53b36ce,
080aa7f5c8557b232005cb947df51968d4629656