Add additional planes/schemes/vanguards

[Sembiance]

yawgatog.com has a few planes/schemes/vanguards that are not present on mtgjson
planes -- Celestine Reef, Horizon Boughts, Mirrored Depths, Tember City
schemes -- Drench the Soil in Their Blood, Imprison This Insolent Wretch, Perhaps You've Met My Cohort, Plots That Span Centuries, Your Inescapable Doom
vanguards -- Jace Beleren Avatar, The Avenger Avatar, The Harvester Avatar, The Hunter Avatar, The Philosopher Avatar, The Protector Avatar, The Warrior Avatar

Additional info:
Missing oversize cards. the planes and schemes are all promos. the planes are listed as the bottom 4 cards on -- http://magiccards.info/query?q=celestine reef&v=card&s=cname -- and the schemes
are listed as the bottom 5 cards on -- http://magiccards.info/query?q=plots that span centuries&v=card&s=cname -- the missing vanguards however i could not find anywhere on gatherer or magiccards.info. they appear to also be promos, but only available online.

Lastly, I should also look into additional data yawgatog may have that would be useful

[dev-id]

Planes are on gatherer: http://gatherer.wizards.com/Pages/Search/Default.aspx?action=advanced&special=true&set=[%22Planechase%20Anthology%22]