Integrating the changes from wessV2_fra project

- Some static content is added,
- new style,
- pages structure defined,
- left menu added, both in "home" and "User data" pages
Fixed selector for active nav-pills style
Removed accidentally pushed file tatus
Fixed selector for leftMenu active style
Moved app-wide styles from main.css to app.css
added the left menu for the weather webpage
Implemented navigation hierarchy for the Home page

principal root: Home,
nested roots: Sites, Goals, Gallery, Contact.
Implemented navigation hierarchy for the User data page

    principal root: User data,
    nested roots: Blog, Post, Data, Wiki page.
Added the nested pages of Weather: Entringen, Poltringen and Tailfingen
Modified the sidebar elements structure to match the navbar component
Set the active state for Home and leftmenu

Both the corrispondent navbar and the left menu tabs are active.
The path to the secondary pages (Sites, Goals..) had to be changed
in order to meet the isActive function needs, see contact.js and
navbar.controller.js for details.
made navbar's isActive function more flexible
Added a title to the left menus
Adjusted the left menus: in a lower position + centered title
Added a link to the Wess logo in the navbar to the Wess web page
renamed dataCount api endpoint
Implemented hourlyAvgForDay API endpoint
Implemented static use of hourlyAvgForDay API endpoint in client
Added line-chart tooltip formatter
Changed waether controller's vars from scope to local