Removed all uses of order parameter in code

The /tracks endpoint no longer will accept a hotness parameter.
It is now removed from the example, and from tests.
Allow queries in named arguments form

It is easier to make client.get("/tracks", q=query) than doing client.get("/tracks?q=%s" % query)
Merge branch 'remove_order' of https://github.com/Zintinio/soundcloud-python into Zintinio-remove_order