1.0.2

• Fixes a bug in the built in Double parser
  • Previously the fractional portion of floating point numbers was parsed
    as a UInt. Unfortunately that mean floating point numbers whose
    fractional part had leading zeros were being incorrectly parsed. For
    example, 1.001 was incorrectly parsed as 1.1. This change switches
    the parsing of the fractional part of a floating point number to be
    intermediated by a string.
• Exposes backtracking
  • This shouldn't be strictly necessary, but it may simplify some parsers a little.