add support for node label param
[JENKINS-24936] Support for Stash Browser for Git plugin
Updated contributing guide

Corrected typos, tidied English, improved formatting, etc.
Merge pull request #299 from declension/master

Updated contributing guide
moved Git browsers to separate context
Merge branch 'JENKINS-24936'

Conflicts:
	docs/Home.md
cleanup
Merge branch 'nodeparam'

Conflicts:
	docs/Home.md
Added possibility to disable creation of a dedicated xvnc authority file