Added Cython declarations for the new [Augmented]InChI[Key] methods.

Author: rwest

rmgpy/molecule.pxd

@@ -146,6 +146,12 @@ cdef class Molecule(Graph):
 
     cpdef str toInChI(self)
 
+    cpdef str toAugmentedInChI(self)
+
+    cpdef str toInChIKey(self)
+
+    cpdef str toAugmentedInChIKey(self)
+
     cpdef str toSMILES(self)
 
     cpdef toOBMol(self)