Add support for quantile and quantileIf functions #21

Job	Run time
3.7 CH=23.8.4.69	1s
3.7 CH=22.5.1.2079	9s
3.7 CH=19.3.5	23s
3.7 CH=18.14.9	23s
3.8 CH=23.8.4.69	1s
3.8 CH=22.5.1.2079	1s
3.8 CH=19.3.5	1s
3.8 CH=18.14.9	1s
3.9 CH=23.8.4.69	1s
3.9 CH=22.5.1.2079	1s
3.9 CH=19.3.5	1s
3.9 CH=18.14.9	1s
3.10 CH=23.8.4.69	30s
3.10 CH=22.5.1.2079	29s
3.10 CH=19.3.5	32s
3.10 CH=18.14.9	27s
3.11 CH=23.8.4.69	15s
3.11 CH=22.5.1.2079	13s
3.11 CH=19.3.5	27s
3.11 CH=18.14.9	26s
3.12 CH=23.8.4.69	13s
3.12 CH=22.5.1.2079	14s
3.12 CH=19.3.5	28s
3.12 CH=18.14.9	27s
Indicate completion to coveralls.io	0s
	5m 45s

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