.ladda-button
.btn-default
.btn-dark
.btn-primary
.btn-success
.btn-info
.btn-warning
.btn-danger
.btn-alert
.btn-system
.disabled .active
.btn-xs .btn-sm .btn-lg
.btn-rounded .btn-gradient
Multiple .btns wrapped in .btn-group
.dropdown-toggle
.zocial .name(eg facebook)
