Add enable_log and fast_reconnect_when_accept_noop_message parameter to icomet.js

enable_log: whether open log function

fast_reconnect_when_accept_noop_message :

With current js library , when web client
 accept noop message from server , it will reconncet after 1~3 seconds.
 As a result , the message push action would not be instant and some
 clients subscribing the same channel may miss messages. With this
 parameter , user can choose the suitable plan according to his own
 conditions.