Bugfix - 3d WKT is incorrectly trimmed trigguring exception in Point constructor

Upon feeding the following wkt to geoPHP:

POLYGON Z((-128.5125933097632 52.591489976786676 0,-128.51202528732318 52.58862587792723 0,-128.5098799959308 52.58765715968268 0,-128.50643860753337 52.58737160240316 0,-128.50560373980377 52.5856333582354 0,-128.50668054947073 52.58332143972203 0,-128.511160140532 52.58295993724388 0,-128.5100295617859 52.57912271135264 0,-128.50769242991024 52.57904768741655 0,-128.50358964234073 52.58000532342339 0,-128.50032107849557 52.58172699664201 0,-128.50026053680517 52.5844023510514 0,-128.50303456469737 52.589381382489094 0,-128.50714344098088 52.59344278653372 0,-128.51070094205588 52.592910223116675 0,-128.5125933097632 52.591489976786676 0))

This exception was triggered:

Exception: Cannot construct Point. x and y should be numeric in Point->__construct() (line 23 of /data/workspace/projects/geoPHP/lib/geometry/Point.class.php).

Ultimately it was because the getDataString method was only trimming off the number of characters making up the basic geometry type and ignoring the Z marker.  A simple answer is to alter that method to trim off all characters before the first parenthesis, as so.