Implement general part of model tutorial. Implement description of node title field
Implement description of node view field
Implement description of node items, search and hidden fields
Implement description of node size and type fields
Implement description of url and source fields. Add anchors to documentation
Implement description of lib, dynamic and route fields
Make fixes according to @tadatuta notations for this pr.
Merge pull request #6 from bem/BEMINFO-389

Beminfo 389