refactor registry package and bleve_registry utility
rename the configurable token map from standard to custom

this makes it consistent with the "custom" analyzer
which operates similarly
also, added it to the config.go so its registerd and
available for use
changed whitespace tokenizer to work better on cjk input

now it will return each cjk character as a separate token
this will pair well with a cjk bigram filter for indexing
fix compilation