*/*: update NGINX JavaScript: 0.8.0 -> 0.8.1 (+)

<ChangeLog>

nginx modules:

*) Feature: introduced js_periodic directive.
    The directive specifies a JS handler to run at regular intervals.

*) Feature: implemented items() method for a shared dictionary.
   The method returns all the non-expired key-value pairs.

*) Bugfix: fixed size() and keys() methods of a shared dictionary.

*) Bugfix: fixed erroneous exception in r.internalRedirect()
   introduced in 0.8.0.

Core:

*) Bugfix: fixed incorrect order of keys in
   Object.getOwnPropertyNames().

</ChangeLog>