Update basicusage.rst

Making the import statements and instantiation of objects consistent to the example found within the Quickstart guide.

Quickstart uses import flask.ext.restless instead of from import statement.
Updated the jQuery example to match the other ones

Updated the jQuery example to match the other ones search for instances of the model ``Person`` whose names contain the letter "y".
Merge pull request #285 from talam/master

Just updated some items within your examples for consistency