Edited Feature: Provide ability to supply friendly Title for actions [520]

Currently we use the name of the Action even for the Title when advertising them. Provide ability to supply friendly Title for actions.

Example(the title "Create Order" below):
--------

{"d":
{
"__metadata": {
...,
"actions" : {
"SampleEntities.CreateOrder" : [{
"title" : "Create Order",
"target" : "Customers(\'ALFKI\')/SampleEntities.CreateOrder"
}]
}
},
"CustomerID": "ALFKI",
"CompanyName": "Alfreds Futterkiste",
...
}
}