Add reminder to log out and in again to update all

See Bug report: http://www.concrete5.org/index.php?cID=376062
Display native language names

see bug report http://www.concrete5.org/index.php?cID=376084
and closed pull request https://github.com/concrete5/concrete5/pull/310
Fixing missing dashboard icons for stacks and block types
updating version number
Fixing error on page type defaults on an upgraded site when trying to copy to child pages
Merge pull request #638 from patrickheck/patch-12

Add reminder to log out and in again to update all
Merge pull request #639 from patrickheck/patch-13

Display native language names
environment cache tweaks with block types
fixing 'Call to a member function getProxyBlock() on a non-object in /core/libraries/block_view.php on line 39' when calling an action URL on a non-object block
making validation helpers extend core helper properly
sanitizing page type names better
fixing notify on form block not working in HTML
removing wrong loader from getPermissionKeyByID
resolving group button problem
fixing bug where composer pages weren't being added to the bottom of the page. Fixing bug where moved pages weren't getting a rescanned display order
adding support for large dashboard
adding addslashes() to install to fix when routines have apostrophes in them
adding page_types to environment override directory
rendering header items on 404 pages
reverting theme paths