Expansions capable#3

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NullTerminator wants to merge 13 commits intomasterfrom

expansions_capable

Commits on May 29, 2015

Commits on Jun 3, 2015

Add checked_in and costs to Attendee accessible data
NullTerminator
committed

Commits on Jun 4, 2015

Add ability to add and delete contacts to ContactList
NullTerminator
committed

Commits on Jun 9, 2015

Commits on Jun 23, 2015

Allow Event.find to take params so expansion params can be provided
NullTerminator
committed

Commits on Jun 25, 2015

Allow .find to take params so expansions can be provided
NullTerminator
committed