0.1.5

New:

• Float parsing rules have expanded to match JSON grammar #68
• Type schema pretty printer #67
• Executor and Validator now return non-formatted Errors to provide more useful information.
• Simplified API for Validators.

Fixed:

• Int values higher than 32bit are no longer inadvertently truncated #69
• The name null can no longer be used as a GraphQL value.
• Parser fixed to not allow on as a fragment name
• AST printer produces strings which match examples in Spec