[FIX] report barcode cast humanreadable
[FIX] web footer link from OpenERP to Odoo
[FIX] doc: clean exercise-dashboard xml to v8

Courtesy of Moises Lopez

Closes: #4336
[FIX] doc: views calendar view attribute name

Courtesy of: Michiels Denis

Closes: #4249
Merge branch '8.0' of https://github.com/odoo/odoo into 8.0-linux64