Fix floating point type (#20)

[krzyc]

Float fields are truncated. Fixes #20.

[njt1982]

This seem to have worked for me...

 org\majkel\dbase\field\NumericField Object
                (
                    [name:protected] => S_XXXX
                    [length:protected] => 9
                    [decimalCount:protected] => 0
                    [load:protected] => 1
                    [filters:protected] => Array
                        (
                        )

                )

vs

 org\majkel\dbase\field\NumericField Object
                (
                    [name:protected] => S_XXXX
                    [length:protected] => 9
                    [decimalCount:protected] => 2
                    [load:protected] => 1
                    [filters:protected] => Array
                        (
                        )

                )

[jan-ccd]

Hey, Is there any chance getting this PR merged?
It would be super useful for me.

[krzyc]

@majkel89 If some action is needed before merging this PR please let me know.