v5.0 - Still Alive Edition

Breaking Change Warning

This release focuses on pulling off a few compat bandaids. Please keep this in mind when moving from v4 to v5.

Summary

• Makes both API and SIM inventory (steam.sim.inventory and steam.items.inventory) __init__ more consistent and adds method for using paging with the SIM endpoints. Note this is a breaking change.
• Removes requirement for scraping inventory context data to use with inventory __init__ because 429s are very common now due to Valve's user hostility, and the kinda-sorta-useful integration isn't worth the hassle of that. Instead getting section IDs (usually 2) is left to the user. Note this is a breaking change.
• Optimizes steam.sim.item and steam.sim.inventory such that context data isn't necessary (though this removes steam.sim.item.category) and the iterator creates items on demand rather than keeping more cache than needed around. Only a breaking change if you directly create steam.sim.item objects or use steam.sim.item.category (in which case, this is just the g_rgAppContextData section category)
• Updates unit tests to deal with Valve's dbaggery slightly better and replaces my defunct account's ID constant with a current one
• Removes .travis.yml because again Valve's being a bunch of dbags and tests actually querying the item API or SIM will more likely than not 429/503
• Update copyright to use my current date formatting style, capping the date like this is an archive just looks too weird to me.
• Makes API wrapper endpoints use HTTPS instead of HTTP (thanks @Scrumplex)
• Updates docs accordingly and supports latest Sphinx/RTD (thanks @ondrowan for initial docs)

Full Changelog: v4.23...v5.0