[IMP] website.snippet: create automatically the thumbnail; data-option became data-js; add data-eval method; rename check_class into toggle_class
[IMP] sale: Allow to set a default value on the SO based on the Sales Team

As the different sales teams might have different sales workflows, this will allow the user to define the shipping policy based on the sales team.
This will be particularly useful to differentiate the workflows of e-commerce sales and usual sales.
[FIX] website.snippet: the background option is not readily usable by the designer
[IMP] Bundle invalidation won't use watchdog afterall
[IMP] refactor bundle ir.attachment cache invalidation
[IMP] account_budget: default value

Adding a context which ease budget encoding as really often, creating a budget means the associated budget lines will follow the same start and end dates. Passing the context allow budget lines automatically have the budget's start and end date
Merge pull request #2050 from odoo-dev/master-theme-review-chm

[IMP] website.snippet: create automatically the thumbnail; fix background
[ADD] Creation of a module to send documents via classical postal ways. This module uses the DocsAway web service. It allows to send single documents or multiple ones (thanks to selection in list views). Here, invoices and sale orders are ready to use
[IMP] Reworked wizards (more summarized, icons to annouce problems) + choice of ink by default for multiple sendings
[ADD,IMP] Added span label tips for multiple messages in case of problem + implemented it in list view
[IMP] Added limited amount of free mails for companies
[FIX] Some fixes before big improvements
[IMP] Single sending: huge optimization (decrese by a factor 3 the number of requests JSON sent to DocsAway
[ADD] Added a new attribute deleteonly for list view
[IMP] Much better performances for multiple wizard
[IMP] Functionnal code, now I will clean it
[IMP] Much more performant multiple wizard