Revert "add max/min to trgionometric priors"

This reverts commit f04ab987

tupak/prior.py

@@ -180,8 +180,6 @@ class Cosine(Prior):
 
     def __init__(self, name=None, latex_label=None):
         Prior.__init__(self, name, latex_label)
-        self.minimum = - np.pi / 2
-        self.maximum = np.pi / 2
 
     def rescale(self, val):
         """
@@ -205,8 +203,6 @@ class Sine(Prior):
 
     def __init__(self, name=None, latex_label=None):
         Prior.__init__(self, name, latex_label)
-        self.minimum = 0
-        self.maximum = np.pi
 
     def rescale(self, val):
         """