Add user model.

- add user model definition
- add user model data fields
- create current user model in application context
Add userbar view.

- add userbar view instead of auth view
- add template for userbar view
- add styles for userbar view
- add test avatar file into images folder
Changes to user model.

- make user info parameters "flat"
Changes to userbar view.

- remove unneeded methods
- replace userbar view file
Changes to userbar template.
Add searchbar model and view.
Add template for searchbar.
Implement header view.
Add template for header view.
Changes to header controller.

- add searchbar model and view creating
- render only header view (temporary)
Changes to styles.
Changes to index.jade.
Rename searchbar model to search model.

- rename model and template
- replace model and template
- make changes in index.jade
Fix user name binding.
Changes to header controller.
Improve header font.
Fix header view.