Adding SmarterCSV.generate; improve behavior of Writer class (#280) #461

Job	Run time
test_matrix (ubuntu, 2.5)	21s
test_matrix (ubuntu, 2.6)	26s
test_matrix (ubuntu, 2.7)	24s
test_matrix (ubuntu, 3.0)	9s
test_matrix (ubuntu, 3.1)	15s
test_matrix (ubuntu, 3.2)	8s
test_matrix (ubuntu, 3.3)	14s
test_matrix (ubuntu, head)	10s
test_matrix (ubuntu, truffleruby)	31s
test_matrix (ubuntu, truffleruby-head)	32s
test_matrix (ubuntu, jruby)	38s
test_matrix (ubuntu, jruby-head)	43s
test_matrix (macos, 2.5)	7s
test_matrix (macos, 2.6)	38s
test_matrix (macos, 2.7)	42s
test_matrix (macos, 3.0)	16s
test_matrix (macos, 3.1)	13s
test_matrix (macos, 3.2)	15s
test_matrix (macos, 3.3)	17s
test_matrix (macos, head)	21s
test_matrix (macos, truffleruby)	30s
test_matrix (macos, truffleruby-head)	33s
test_matrix (macos, jruby)	35s
test_matrix (macos, jruby-head)	44s
finish	0s
	9m 42s

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