[imp] Language (en-GB) standardisation. Closes #4162, closes #4160
[bug] Small fix to fix double slash in "refresh helpsite" url. Fixes #4143
Run PHPCS on Travis, turn off code coverage report on Travis
[imp] Remove phpcs exceptions for plugin folders. Closes #4170
small typo in comment
Update en-GB.com_templates.ini
Fixes #4173
Code style

Fixes #4172
Update en-GB.com_templates.ini

Simplify a language string. Fixes #4163
Log clientip Fixes #4158

In logs/error.php missing client IP column.
Wrong JText causes mixed string use. Fixes #4156e
Remove reference to JoomlaCode