README: mention BROWSER_LABEL

I was not sure how to change the browser to use, turns out we simply
have to specify its name with the BROWSER_LABEL:

  export BROWSER_LABEL=phantomjs # Linux/Unix/Mac
  set BROWSER_LABEL=phantomjs # Windows

This adds a mention in the README file.

Change-Id: I54e4d8fc5f8b6b3e6e6a16749b9179a535bff87f
Merge "README: mention BROWSER_LABEL"
Deleted Jenkins jobs that run ULS tests at sandbox.translatewiki.net

No ULS tests are tagged @sandbox.translatewiki.net. There were a couple
of Jenkins jobs, disabled for the last 10 days, probably because they
were failing all the time.

Change-Id: Ib3d12695f8797a37acc28949c3cc5836b1a713b1
Created the MEDIAWIKI_USER environment variable

Bug: 54523
Change-Id: I9a754ae8b10651329e077b4df57b95e0cb12ba50
POC for flow browser test

Simple tests for anonymous adding a topic, and a logged-in user adding a
topic that has author links.

Change-Id: I63f593c4b3e694dd97d7273a85dbbb77e972404c
There is new repository with browser tests, TwnMainPage

Documented how to create Jenkins job to run tests at sandbox.translatewiki.net.

Change-Id: I00418f00c612b9e220c4f1b6303190209b729c32
Updated Ruby gems

Change-Id: I09a77bcdeb04cb465108832f4d7fdc0063331519
Print/export open by default on test2wiki. see Bug 54886 for beta

Change-Id: I9fd071b48be59753215b8bcafd62302df3fcb985
id changed for searchButton in master; also had bogus step

Change-Id: Id77fe9b9f9a2bfd1e2330ca27883bef863614176
Merge "Print/export open by default on test2wiki. see Bug 54886 for beta"
Merge "POC for flow browser test"
Change @does_not_exist_page_name to @random_string

The flow test in development missed this update.

Change-Id: I665fb7557c9b61c0ab3607430202b684e61bb29c
id value for Search button changed

Change-Id: Ia191b881871010499622fc34abf65e41adcf5143
two preferences removed, collapsible and experiments

Change-Id: Ic8e273ca94f85e609709190260b10dadbf00b416
this fixes the Math test and is needed for further Flow updates

Change-Id: Ibf84650c71f7363aab863ab5c70c71823eb3af55
Merge "this fixes the Math test and is needed for further Flow updates"
Fixed Hotcat test - plural/singular for Categories link

Bug: 54244
Change-Id: I0204b809a915c271a675c108dc592da4e38b9084
Flow tests are moved to Flow repository

In commit https://gerrit.wikimedia.org/r/#/c/88925

Bug: 53582
Change-Id: I9d9da185187180c116a4bc40eb2d38c1ae7ef14a
Merge "Fixed Hotcat test - plural/singular for Categories link"
Updated Jobs and documentation who gets e-mail notification when a Jenkins job fails

Only for jobs that run Selenium tests.

Bug: 53578
Change-Id: I5dc293e66beb623ade204a3609af1d5a27ce0b77