Expand mutation and introspection support#193

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jamesdabbs wants to merge 4 commits intohaskell-graphql:masterfrom

jamesdabbs:master

Commits on Jul 25, 2018

Support __typename introspection
jamesdabbs
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Commits on Aug 7, 2018

Expand introspection system
jamesdabbs
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Commits on Aug 13, 2018

Introspect args, enumValues, inputFields
jamesdabbs
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Commits on Aug 14, 2018

Finish schema serialization conversions
jamesdabbs
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