Add test of one slide with no button and fix test of params for button.

When only one slide, no indicators and controls.
More than two slides, params for button work.
And this commit contains that delete unnecessary white spaces.
Set if statement in checkParams() when slide is one, indicators and controls are off
Add tests of multi slides structure
Add tests of view and data are correctly combined
Fix tests as correctly showing image's alt
Fix preg_replace as check strict html close tag
Add tests of view and param are correctly combined

Now, all tests green!
Merge branch 'feature-slide-plugin' into refactor-medialist-plugin