remove alert from front page
lumen: fix navbar-btn, closes #252
flatly, darkly: fix input-group-addon borders, closes #254
flatly, darkly: fix .checkbox and .radio state colors, #254
cosmo: fix btn sizing for input addons, closes #255
make splash gradient less green
update favicon
readable: fix margins on navbar-form, closes #257
update node version
amelia, cyborg, slate: more subtle thumbnails, closes #258
darkly: clean up modal and breadcrumb code, fixes #262
clean up front page style
increase padding on preview panels
fix border on input-group-addon states
add alert for ebook giveaway
fix close buttons in panels, closes #266
remove alert for ebook giveaway
3.1.1 -> 3.2.0
fix bsa code
update sponsor