Tuple unpacking incompatible with Python 3.4 and less.

[abhikpal]

    from p5 import *
  File "/Users/arihantparsoya/Documents/p5/p5/__init__.py", line 19, in <module>
    from .sketch import *
  File "/Users/arihantparsoya/Documents/p5/p5/sketch/__init__.py", line 19, in <module>
    from .base import *
  File "/Users/arihantparsoya/Documents/p5/p5/sketch/base.py", line 29, in <module>
    from ..opengl import renderer
  File "/Users/arihantparsoya/Documents/p5/p5/opengl/__init__.py", line 19, in <module>
    from .renderer import *
  File "/Users/arihantparsoya/Documents/p5/p5/opengl/renderer.py", line 33, in <module>
    from ..pmath import matrix
  File "/Users/arihantparsoya/Documents/p5/p5/pmath/__init__.py", line 22, in <module>
    from .curves import *
  File "/Users/arihantparsoya/Documents/p5/p5/pmath/curves.py", line 46
    ret_value = func(*new_args, parameter, **kwargs)
                                       ^
SyntaxError: only named arguments may follow *expression

If tuple unpacking is something we really need we'll have to make Py3.5 a dependency, else we figure out a way to make this backwards compatible.

See #18 and #22 for more context. Also: thanks @parsoyaarihant for pointing this out!