docs layout and alignment refinement

BS3 commit f2e35bf7027e8274e28e46b41efb93f4c03184eb
remove old glyphicons mention

BS3 commit b09fcc019c68b502f2f6809020bd3a8761c1d421
update urls

BS3 commit 6b24297c5beca5adc118d0524c50700928687c1c
Update progressbar docs

BS3 commit db5aee54dfab6368f5183327b8a1a7c15b1ed8e2
combine and simplify caret border widths

BS3 commit 73a1a4133c484d0791efff87bc41eac3e2853e42
add migration

BS3 commit a5ac0b74987310c0c706437e57834cc160defbb4
fixes 9786: enable tables in panels

BS3 commit ef4590dfb461036c915d8fbc5b6fbf3ad7ba9c86
fixes #9790: nullify right padding in container-ed navbars when last element in collapse is a right aligned navbar nav

BS3 commit 9b66e6b0f4e642609e8b7ba2b8590d2c31fe0469
rename HTML5 validation Grunt task since it checks the examples too

BS3 commit b5d87fc42b04d74b25101293c83d8a4f01a3e22c
rm redundant ampersands from button-groups LESS

BS3 commit fa3959a1e10da848867be73ac1d18d209367a9b0
Update jumbotron. Reorder bootstrap.less to match docs oder. Navbar update. undo old change to navbar brand from this branch. Restore glyphicons. docs layout and alignment refinement. Upgrade to latest glyphicons. combine and simplify caret border widths. fixes 9786: enable tables in panels. fixes 9768: unbold buttons. fixes #9790: nullify right padding in container-ed navbars when last element in collapse is a right aligned navbar nav

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