2884: AJAX load a preview panel in collection and pipeline template picker.
2884: Can now choose a specific folder to browse in the file selector modal.
2884: Selecting folders works for run pipeline dialog.  Increased page size
from 20 items to 40 items.
2884: Fixed horizontal scroll in folder selection dialog
2884: Added spinner to indicate infinite scroll is loading.
2884: Adjusted column size on components page to work better when used in
chooser preview pane.  Removed spurious console.log statement.
2884: Added fail callback preview loading fails.  Added comments explaining a
couple of things.  Removed spurious puts.
Merge remote-tracking branch 'origin/master' into 2884-improved-picker
Merge branch '2884-improved-picker' closes #2884