issue2550991 - Some mechanism to set expiration header or max age for static resources

Work was done in 2.0.0 to add support for cache control headers.
This checkin sets default values for javascript (2 weeks) and
css (2 month) files.

Forgot to commit CHANGES.txt.

Author: rouilj

CHANGES.txt

@@ -88,6 +88,8 @@ Features:
   Rouillard)
 - REST correct values for some Access-Control-Allow-Methods and
   Access-Control-Allow-Headers headers. (John Rouillard)
+- issue2550991 - define default cache control settings for javascript
+  and css assets. (John Rouillard)
 
 2021-07-13 2.1.0