Set cell menu font size to pixels instead of ems so that it doesn't change size between code cells and text cells.
Darken toolbar buttons on hover. Switch play icon.
Add disabled state for buttons.
Make inputs large in modals, with more padding. Right align labels.
Change link colors while editing text cells; was making markdown links orange and green.
Make instruction after creating a client more explicit.
Merge pull request #239 from mulesoft/ui-fixes

UI fixes