### Loading

1. The data should be loaded with:
  * first paragraph with default (left) alignment,
  * second paragraph aligned to right,
  * third paragraph should be centered,
  * fourth paragraph should be justified,
  * an image with caption between first and second paragraphs.
2. Toolbar should have four alignment buttons for alignment control: left, right, center and justify.

### Testing

You should be able to:
1. Change alignment on any paragraph.
2. Change alignment on any selection of paragraphs.

You should not be able to change alignment of figcaption by:
1. Placing cursor inside caption.
2. Selecting image with other paragraphs.

You should be able to create blocks that can be aligned:
1. paragraphs
2. headings
3. lists

Alignment UI should:
1. make "left" button highlight "left" when selection is inside left aligned block (default one)
2. make "right" button highlight "right" when selection is inside right aligned block
3. make "center" button highlight "center" when selection is inside centered block
4. make "justify" button highlight "justify" when selection is inside justified block
5. only one button should be active at once inside dropdown


