(Awesm:Url) add option for encoding urls used in the url parameter

[mdurn]

For example, if the target url is:
http://www.example.com/?param1=1&param2=2

the & should be encoded as %26 before appending to the awesm api call. If the url is being appended as a parameter to 'destination' (e.g. twitter), the target url needs to be double encoded (& becomes %2526):

http://api.awe.sm/url/share?v=3&url=http://www.example.com/?param1=1%2526param2=2&key=5c8b1a212434c2153c2f2c2f2c765a36140add243bf6eae876345f8fd11045d9&tool=mKU7uN&channel=twitter&destination=http://twitter.com/intent/tweet?text=This+is+the+coolest+API+evar!%26url=AWESM_URL%26via=awesm&parent=awe.sm_s5d99&user_id=42

Characters requiring encoding:

• & => %26
• % => %25

• => %23