added Travis status to the README
pulled RenderSet loading out of the individual test cases
moved the card RenderModel instances to a new static Cards type for use across tests
set up CardSet as a List<Card> with automatic 'parent' handling
added duplicate key checks and get-by-title
added counterspell to the test set, and made an actual CardSet instance for it.
changed RenderModel.body from a list of paragraphs to a list of lines, and where a paragraph break is wanted, an explicit paragraph line is used.
changed expected power/toughness to have spaces around the slash for short values
put a toString on Paragraph so it shows up as a paragraph symbol
wrap flavor strings' toString in braces for differentiation
created the start of a parser for card bodies