add tests for vector assign iterator, and tests script

tests/test.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+# cd $(dirname $0)
+
+make stl > /dev/null
+./containers > tests/output_stl.log
+
+make ft > /dev/null
+./containers > tests/output_ft.log
+
+diff --context=0 --color=always tests/output_stl.log tests/output_ft.log