Add rest-coercion tests for zero-prefixed numbers

[bajtos]

Add tests describing behaviour for numbers with a leading zero, see #143.

• When the argument's type is any, strong-remoting will treat integer numbers starting with 0 as string, e.g. 0668 will preserve the leading zero. However, floats are still converted to numbers, e.g. both 0.42 and 00.42 are converted to a number.
• When the argument's type is number or integer, strong-remoting will treat integer numbers starting with 0 as numbers and discarding any extra leading zeroes.

Forward-port #346
Connect to #312