#7 Please support BigDecimal as base type

[Anonymous]

I have an attribuite which type is BigDecimal.
JOX can write it as empty tag only and can't read it
since BigDecimal has no constructor with empty
argument.

Becuase float and double will cause wrong calculation,
we would like to use BigDecimal to guarantee the
mathematical calculation is correct.

Please change JOX to support BigDecimal as the base
type of property.