Prepare the 1.6 compatibility

[nidup]

PIM CE 1.6 & EE 1.6 compatibility,

The 1.5 compatibility is now ensured in 1.2 branch.

With this PR master become 1.6 branch (to discuss because we can't align the version number for all bundles, for instance the CustomEntityBundle has already a branch > 1.6).

This bundle may be removed once the Pimgento module will use the native attribute and family exports.

TODO:

• [x] migrate the family export
• [x] double check the file content (attribute and family export)
• [x] add PHP 7 compatibility in travis
• [x] bump phpspec to 3.0.0 ?
• [x] rebase
• [x] review from markeplace team

[jmleroux]

You should also modify the Travis file to not build with PHP < 5.6

[nidup]

done :)

[jmleroux]

I would also provide an upgrade like this one with the sed command needed to fix namespaces.

[fitn]

Thank you @momoss We are waiting the training tomorrow to better understand the new batch job architecture ;)

[fitn]

GTM