Introduce `Node#has_element?` (#2700) #94

Job	Run time
headless (3.2, spec_chrome)	12m 31s
headless_base_versions (3.0, spec_chrome)	12m 4s
headless (3.2, spec_firefox)	18m 44s
rack_3 (3.2, spec_rack)	3m 44s
headless_base_versions (3.0, spec_firefox)	18m 18s
non_headless (3.0, spec_chrome)	12m 41s
non_headless (3.0, spec_firefox)	19m 1s
remote_chrome (3.0)	11m 43s
rack_smoke (3.0, rack_smoke)	34s
remote_firefox (3.1)	11m 41s
rack_smoke (3.0, cucumber)	24s
rack_smoke (3.1, rack_smoke)	30s
rack_smoke (3.1, cucumber)	21s
rack_smoke (3.2, rack_smoke)	27s
rack_smoke (3.2, cucumber)	23s
	2h 3m 6s

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