Fix/upgrade to CodeMirror 3 event handling
Change 'Text Mode' to 'Text View'
Fixed CodeMirror 3 code completion
Fix introspect popover to work with CodeMirror 3
Documentation improvements
Improve text navigation between cells when evaluating or deleting
Make worksheet layout width fully responsive
Show all evaluate buttons and fix focus/blur bug
Fix text navigation focus/blur issues between evaluate and text cells
Add parenthesis matching
Merge of master