Avoid hash conflicts for pulses

[dieris]

Fix #77

[coveralls]

Coverage increased (+0.006%) to 58.081% when pulling dca600b on fix/hash-conflict into f282ca4 on develop.

[dieris]

It turns out you can't pickle.dump a function... (stack_shapes) when the pulse shape results from a merge

QGL/QGL/Compiler.py

Lines 204 to 210 in f282ca4

	def stack_shapes(entry1=entry1, entry2=entry2, **kwargs):
	return np.hstack((
	entry1.amp * np.exp(1j * entry1.phase) * entry1.shape,
	entry2.amp * np.exp(1j * (entry1.frameChange + entry2.phase)) *
	entry2.shape))
	shapeParams['shape_fun'] = stack_shapes

[dieris]

Closing for now