Update functions.c

WIP. Changing coefficients to double
Update main.c

Changed add polynomial values to double
Update polynomial.h

Removed createPolynomial from older code-> was replaced with setup.
Changed coefficient to suit other changes to functions.c
Update functions.c

Updated print to skip a line for entering last coefficient and also added + signs to make it look better(ish)
Added commented code for initializing all of polynomial array data's variables. Dunno if we should put this in
Update functions.c

createPolynomial now takes user input and makes assigns all a polynomials coefficients.
Print now has a case to print last variable with a line skip and includes pluses to make it look better.
Update main.c

Added case to add a polynomial. 
Case do while doesn't loop when I run it. Leaves after first pass.
Other small changes. int to double etc.
Update polynomial.h

Small changes. Declarations, parameters etc.
Merge pull request #1 from GearoidCremin/master

14/11/14