Description:
------------
It appears all of the EMA functions within the Trader PECL package return their responses to a fixed 2 decimal places.

When trading, having 5 decimal places of precision is required and as such, these functions in their current form are somewhat useless.

I'd like to suggest implementing a third, optional parameter for $precision:
array trader_ema ( array $real, integer $timePeriod [, integer $precision = 2] )

For backwards compatibility reasons, I'd suggest the default value remains set to 2 to mimic current behavior so the change is non-breaking.

This change request applies to the following functions (although many more of the Trader functions might also benefit from this too):
 - trader_dema
 - trader_ema
 - trader_tema

Test script:
---------------
$real = [
    1.00215,
    1.00217,
    1.00209,
    1.00205,
    1.00211,
    1.00211,
    1.00215,
    1.00217,
    1.00209,
    1.00205,
    1.00211,
    1.00211,
    1.00215,
    1.00217,
    1.00209,
    1.00205,
    1.00211,
    1.00211
    1.00215,
    1.00217,
    1.00209,
    1.00205,
    1.00211,
    1.00215
];

$emas = trader_ema($real, 10);

print_r($emas); // All resulting values have been fixed to 2DP

Expected result:
----------------
Either the resulting values from the EMA functions should mimic the maximum number of decimal places supplied in the $real array. Or, better yet, we should be able to specify an additional, optional argument for the precision as mentioned above.

Actual result:
--------------
All resulting values are fixed to 2DP.