Modify list parameters handling in tx build

[NeoDashboard]

Modify list parameters handling to remove useless OpCodes and reduce fees.

[ixje]

2 minor things

1. Please add a test case for coverage. Can be as simple as this

   neo-mamba/tests/test_vm.py

   Lines 141 to 147 in bcb1ef1

   	def test_emit_push_dict(self):
   	data = {"a": 123, "b": 456}
   	sb = vm.ScriptBuilder()
   	sb.emit_push(data)
   	expected = "007b0c016101c8010c016212be"
   	self.assertEqual(expected, sb.to_array().hex())

2. don't change the version numbers. That will be done during a release

The rest looks good :)

[coveralls]

Coverage: 80.972% (-0.03%) from 81.0% when pulling 38fe835 on NeoDashboard:master into bcb1ef1 on CityOfZion:master.

[ixje]

Do you still want to continue on this?