feature: added parameter check for aes.lua. 

add more doc and fix buffer length error. 

bumped version to 0.12. 

doc: updated the copyright years. 

bumped version to 0.11. 

bumped version to 0.10. 

bugfix: resty.aes: fixed memory overrun bug when user provided a salt… … of less than 8 characters but EVP_BytesToKey() expects more. disallows salt strings longer than 8 characters to avoid false sense of security. Signed-off-by: Yichun Zhang (agentzh) <agentzh@gmail.com>

bumped version to 0.09. 

bumped version to 0.08.