auto overflow for multiple selects, fixed #527
fixed compass single-box-shadow warning (2.6.x)
new blocks: header, navigation, user-tools, context-navigation (2.6.x), see #538
removed obsolete header include (2.6.x), #418 (and #538)
fixed minor spelling error
Merge branch 'master' into dev/2.6.x
changelog update
Removed note about order of STATICFILES_FINDERS from the docs (2.6.x), #531
Triggering change when input is changed in autocomplete (2.6.x), #537
final updates for 2.6.3 release
updated dev version for 2.6.x to 2.6.4
Post-review fixes for #528, 1
Merge upstream