Float type coercion has changed

[anthmatic]

Previously the float filter would return 0.0 when trying to coerce a non-numeric string. It looks like after #178 (change to numberFormat.parse()) strings that start with numbers can be converted to floating point numbers.

Before:
"30%"|float == 0

After #178 :
"30%"|float == 30

[pfarrel]

Hey @anthmatic, you're right, that was an unintentional change. I'll look at fixing it.

[boulter]

I believe this was fixed by #191