add parse_ixbrl_diskcache_version to accelarate access parsed ixbrls. #90
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The logical content of public xbrl can be thought unchangeable lately when it is submited or publiced by the organizations, so its parsed result can be cached in disk to accelerate accessing lately. For HttpCache caches xml files in disk, not python object dumps, parse_ixbrl function is very slow for it will parsed xml to make python object(xbrl instance) again . I add parse_ixbrl_diskcache_version function, it uses diskcache to store the parse result in python object dump format. For load the python dump file is faster than get object from parsing xml. I recommend to use diskcache replacing HttpCache to cache parse results. In addition, diskcache hide the cache detail to let the user merely focus on parse xbrl file or url.