Merge branch 'hotfix/1189'

Close #1189
Merge remote-tracking branch 'origin/pr/1206'

Close #1206
[zendframework/zf2#4785] Add documentation note about CSRF naming

- CSRF elements need to be uniquely named on the same page when multiple forms
  are present.
Merge pull request #1217
Merge pull request #1217 in develop
Merge pull request #1217 in master
Gravatar documentation first steps
Work in progress
Corrections
Last example
[2.2.6] updated release version
Merge branch 'releases/2.2.6'

2.2.6 release readiness
Merge branch 'releases/2.2.6' into develop

2.2.6 release readiness

Conflicts:
	docs/languages/en/conf.py
Fix for tabulations

Now there are 4 spaces for tab
Indents fix
One more fix for indent
Corrected about passing null to secure setting
typo
Merge pull request #1219
Merge pull request #1219 in develop