Added result logging functionality (#2)

All test commands now utilize the "-l" or "--log" flag to specify a file to log results to.

Reviewed-on: #2

lib/io.go

@@ -0,0 +1,16 @@
+package lib
+
+import (
+  "fmt"
+  "os"
+)
+
+func WriteToFile(filepath string, content string) {
+  file, err := os.Create(filepath)
+	if err != nil {
+		fmt.Println(err)
+	} else {
+		file.WriteString(content)
+	}
+	file.Close()
+}