v2.6

This is essentially a bug fix release (#155, #158, #162, #167 & #193).

There is also two new definitions:

• the JSON node "one" should not be null ;
• I press the 2nd "Submit" button.

And this release prepare the 3.0 version with depreciate the Sanpi\Behatch namespace in flavoor of Behatch (#103) and change context alias to behatch:context: instead of behatch: (#121).