Migrated to use MyGene.info v2 API.
With the support of v2 API, "query" and "querymany" methods now both support "fields" parameter to return user-specified fields for gene hits.
"filter" parameter is replaced by "fields", "filter" is still kept for back-compatibility.
New "species" parameter for all methods for filter by species.
"getgenes" and "querymany" methods are both support very long input list. It splits input into multiple batch queries with 1000 query terms as one batch, and concatenate the result automatically.
"findgenes" method is deprecated now, still kept as an alias of "querymany" method.