autorelease pool for osx mavericks check
add concept of extended file types and simple test implementation for shiny
pickup all .r files in shiny extended type
provide a link to the 'full' shortcut docs from the quick reference card
rebalance columns, add some more unbound editor shorcuts
resolve conflict with Ctrl+Shift+K on non-Mac OS
add keyboard shortcut shortcut to reference
remove inapplicable commands for shiny source files
fix bug: negative scrollbar height during boot (superdevmode only)

Some GWT internals wind up with a negative height while calculating the
height of a scrollbar; the problem is timing-dependent and doesn't
happen while stepping over the calculation in the debugger.

Because the errant calculation is several calls into GWT and difficult to
influence from RStudio code, this "fix" sidesteps the issue by deferring
the creation of the offending DataGrid until the event loop is finished.
The fix also has the side effect of avoiding the unnecessary switch
between grid and list view that formerly happened on boot when the user
pref was set to grid view.
Merge branch 'master' into feature/shortcut-info
Merge branch 'feature/shortcut-info'
don't show focus rect on shortcut panel
restore execute current section shortcut
enable code execution from within the source viewer