Deprecate font-size, font-family, line-height methods on EditorView.
Deprecate EditorView::setShowIndentGuide
Deprecate setShowInvisibles
Merge pull request #3518 from atom/bo-font-settings-in-model

Deprecate font-size, font-family, line-height, invisibles, indent guide methods on EditorView
Upgrade first-mate with new docs
Upgrade to wrap-guide@0.22
Remove unused param
Wait for initial stylesheet load to complete

Instead of measuring on each stylesheet load at startup,
wait for the initial load of all the stylesheets to complete
and then do the necessary measurments.