Changes:
* Introduce Jan's beautifully documented $wgMinervaABSamplingRate
Set to 1 to A/B test 50% of the population
* Split out ambox template styles into a separate file referenced
by hacks.less
* Update cleanuptemplates setup script to consider two buckets
Test pages:
* Shqiponja_Partizane
* World_War_II_in_Albania
* Liberation_of_Tirana
* French_Consulate
* Abd_ar-Rahman_IV
* M109_howitzer
* Aimoin
* Transport_in_Brazil
* Transport_in_Cape_Verde
Bug: T191303
Change-Id: I8d11e655ccb847b7999e64dda57b225ad8b1c23a
This will use the srcset attrribute which was introduced with HTML5,
in order to load the svg image on supported browsers.
Should fix the bug after merging change 394820.
Bug: T166684
Change-Id: I2337b750c80e79c816dc817dfe230e063eed0345
jdlrobson
David Sn