remove todo. imports more than I'd like.
revert unnecessary customizations of Blob.js & FileSaver.js

BS3 commits: 5ead87d519682c68b18bf796273da70a32b68a96
upgrade tooltip/popover-in-groups callout from info to warning

BS3 commits: 2ba15c375067aa23e6876caba1bc5a2313ca793b
downgrade <label>-related callouts from danger to warning

BS3 commits: 811639c4528d9b6f96f4800a807cf8769fa765fc
upgrade form-group + input-group callout from info to warning

BS3 commits: 76e226b136c27e164a9864ad7690d0705a2906fb
downgrade .img-responsive cross-reference callout from warning to info

BS3 commits: 488443c9ad477ebd7f3c22db5caf088faf08f31a
clarify docs regarding non-mixable components

BS3 commits: 9ebd8d39a9d5853dd66ebed9a5f17e327e99f3ac
Fixes 12210: badges in xs buttons

BS3 commits: 413c8a6da533c59bb9a923901b5358ddb61564a5