[2.3.x] Initial changes for :
    - https://java.net/jira/browse/GRIZZLY-1594 (ReadHandler callbacks should not be performed in I/O thread.)
    - https://java.net/jira/browse/GRIZZLY-1593 (Mirror for https://java.net/jira/browse/GLASSFISH-20681 (TimeoutException when delivering static web sites))
[2.3.x] + implement task #1212
http://java.net/jira/browse/GRIZZLY-1212

"Rework Reader implementation"
[2.3.x] + fix typo