v2.7.3

Docs fixes

• Overflow tabs #59
• Toast's deprecated warning variant #67

Bug fixes

• Fixed deletable tag icon alignment in Safari 10, fixes #66 (#78)
• Fixed text alignment when text < min-width in Safari 10, fixes #76 (#77)
• Fixed #79 by adding display: block to spectrum-Accordion-itemHeader
• Fix dropdown and menu width for IE11 #73