Add support for AggregateFunction #26

Job	Run time
3.7 CH=23.8.4.69	1m 9s
3.7 CH=22.5.1.2079	55s
3.7 CH=19.3.5	55s
3.7 CH=18.14.9	51s
3.8 CH=23.8.4.69	38s
3.8 CH=22.5.1.2079	42s
3.8 CH=19.3.5	29s
3.8 CH=18.14.9	33s
3.9 CH=23.8.4.69	40s
3.9 CH=22.5.1.2079	36s
3.9 CH=19.3.5	32s
3.9 CH=18.14.9	27s
3.10 CH=23.8.4.69	33s
3.10 CH=22.5.1.2079	36s
3.10 CH=19.3.5	31s
3.10 CH=18.14.9	31s
3.11 CH=23.8.4.69	37s
3.11 CH=22.5.1.2079	32s
3.11 CH=19.3.5	33s
3.11 CH=18.14.9	35s
3.12 CH=23.8.4.69	1m 4s
3.12 CH=22.5.1.2079	55s
3.12 CH=19.3.5	56s
3.12 CH=18.14.9	53s
Indicate completion to coveralls.io	4s
	16m 47s

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