Add filter to allow override the cache widget id
Removed ununsed global variables in local scopes
Merge pull request #5638 from coenjacobs/code-cleanup

Removed unused global variables in local scopes
Merge pull request #5628 from tszming/fix-cached-widget

Add filter to allow override the cache widget id
This should be static
Fix address format in plain text email
Add  2.1.11 read me