Update jzip to v2.1.0.

BS3 commits: aae64a9eba915bd4dd472c42de2e115e13c43dda
bs-raw-files-generator.js: use the global directive to define the `btoa` variable.

BS3 commits: 5769b776e5fb0dccf080878505c3c097f9c2ce3b
use Less' extend feature in btn-group-lg etc.

BS3 commits: 651b289e269f8806e4e30854b99410dd7c9b3c38
Remove redundant :-moz-placeholder styles

BS3 commits: 42d7479dbfb5265fa50728ad0934614f902b5533
remove unneeded .thumbnail > img, .thumbnail a > img
rm DIY full-width callout now that there's .container-fluid

BS3 commit: 77d160151f2e9ae7330010d5d7034f6a000eda09
Fixes 12611: Mention limitation of one plugin's data attributes per element

BS3 commits: ebd132ce68b79a95daf6ef91225304e9656cd4a4
Fixes 12614: Add progress bar example with visible label

BS3 commits: 3b4b9a7fe58082cde1545167e511a4acc6d5a0fb
Fixes 12555: Rearrange variables to place grids and containers closer

BS3 commits: 228d4e59fcdb0e05811821a9aff899e7b4e5f4d9
Fixes 12526: Add scrollbars when necessary to the Dashboard example's sidebar

BS3 commits: f83b20100728ee7fa6c661ccee289dd003822cdc
Clarify target of dropdown events

BS3 commits: b4aaf04b3fa710439d774df8842861e9cf7ee035
Fixes 12477: Clarify IE support in docs

BS3 commits: c399bfb01581fcc89474bb1d23718d279e246b45
Override iOS search input's extra round corners

BS3 commits: da43f97be170b9c14623d1615721755a9a5959cc
grunt for days

BS3 commits: 3ccc16cad078cfcc76f3b9362f0039b0566d8914
Follow up to 1bdd59b, to better position the sidebar so the potential scrollbar doesn't get hidden by the navbar

BS3 commits: cae76171d0bb6f461829b063735ffd84d6b2a07f
Fixes 12486: Restore full width inputs for input groups in inline forms and navbars

BS3 commits: 4d7b2ddba92e47f923d22d9d7b23cb7b0a3e0bc2
Fixes 12555: Rearrange variables to place grids and containers closer

BS3 commits: 228d4e59fcdb0e05811821a9aff899e7b4e5f4d9
use Less' extend feature in btn-group-lg etc. use :extend(.img-responsive) in Carousel's Less. Fixes 12555: Rearrange variables to place grids and containers closer. grunt for days. Fixes 12486: Restore full width inputs for input groups in inline forms and navbars

BS3 commits: 651b289e269f8806e4e30854b99410dd7c9b3c38,
596495c89bd6019c4a2949771b48234daecfd4cb,
228d4e59fcdb0e05811821a9aff899e7b4e5f4d9,
3ccc16cad078cfcc76f3b9362f0039b0566d8914,
4d7b2ddba92e47f923d22d9d7b23cb7b0a3e0bc2
grunt