Issue 2152: sin, cos, exp, re, im = [abs]*5 in sympy/assumptions/handlers/sets.py

Removed all the extra functions from all the classes in sympy/assumptions/handlers/sets.py and just kept two functions in each class- one returning True and other False. 
The other functions were defined using these two functions for e.g. sin, cos, exp, re, im, NumberSymbol, Abs, ImaginaryUnit = [Number]*8 in AskComplexHandler class.