Clarify the use of .has-feedback

BS3 commits: e7a337a8f15e1719b161b80e5d0b00a1427522fc
Removed unnecessary top margin from .modal-footer

BS3 commits: f3e172a81f0b0a08cc4aea1f252b74ed732d9939
Make .table-responsive usable as mixin

BS3 commits: c7b07a56449cb6dffd1f8cea6d74b2694b022eb9
grunt

BS3 commits: 4b622c60c1cc215aa30df572bbb638033cebaa29