snakecase 0.9.2

cases: added to_sentence_case() (same as snake, but first letter is uppercase and default sep_out is space).
numerals: added numerals argument to all caseconverters including to_any_case() to format the alignment of digits (middle, left,right, asis). Therefore parsing_option nr 4 might be removed in later releases, as it is the same as parsing_option = 1 and numerals = "asis".
transliterations: When named character elements are supplied as part of transliterations, anyting that mateches the name is replaced by the corresponding value.
attributes are now preserved (not only names as before)

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