Merge pull request #18 from RJacksonm1/master

Adjust `assets` and `asset_item` classes to work when the API does not p...
Add top level socket error string to HTTPError reason
Bump version to 4.7
Add workaround for @ValveSoftware being silly with CSGO (again)
Adjust remote storage URL in test case to reflect apparent CDN move
Bump version to 4.8
Fallback gracefully on weird effect_types
Allow override of format and key params in steam.api

Now that Valve is introducing requests that return different results
depending on the key it is sometimes helpful to be able to override it
on a per-call basis. The usefulness of overriding the format is not yet
evident but who knows. Maybe valve will do things like mediawiki and
other places and have different kinds of json available
Bump version to 4.9
Added a way to get item quality strings from items loaded via SIM