Make graphql-c_parser optional with warning when unavailable #1003
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graphql-c_parser requires native C extensions which don't work on all platforms (e.g. JRuby). By making it optional, ElasticGraph can run on more platforms while still recommending the faster parser.
GraphQLGemLoader loads both
graphqlandgraphql/c_parsertogether. When c_parser is unavailable, prints a yellow warning to stderr (once) directing users to add the gem. Warning is suppressed on JRuby since C extensions can't work there anyway.New projects still include graphql-c_parser in their generated Gemfile since it's recommended for better performance.