hi i added an overloading constructor that allows an addition of specified timepiece to the Wander.java class. this is my first ever contribution to any real project so please give feedback if there are any issues with the changes

possible fix to issue libgdx#80

i took into account that i shouldn't change the static timepiece in the GdxAI class so i gave very wandering option its own timepiece based on the GdxAI class while having an overload constructor that would allow a different timepiece if needed.

i apologize i forgot to replace GdxAI.getTimepiece() to timepiece in calculateRealSteering