StepDefinitions.seriesAddedToCollection(): modify test logic

[php-coder]

I suggest to improve the following method:

mystamps/src/test/java/ru/mystamps/web/tests/StepDefinitions.java

Lines 69 to 75 in f72c87d

	public void seriesAddedToCollection() {
	driver.get("http://127.0.0.1:8080/series/1");
	String actual = driver.findElement(
	By.xpath("//*[@id='series-danger']//ancestor::form/p[1]")
	).getText();
	String expected = "Series is part of your collection";
	assertEquals(expected, actual);

Instead of what it is doing now, it should:

• check that the message Series has been added to your collection is presented on the current page (hint: find an element with this message by a class name)
• find a link near the label "new" and inspect its href attribute (is should equal to /series/1)

This also give us a couple benefits:

• xpath will gone
• we'll get a little speed improvements

Also our code will test collection page instead of a series page, that is more logical for a test of collection :)

Tech debt for f72c87d (#46)

[php-coder]

Won't fix as we're going get rid of Cucumber JVM (#1019).