allow --skip-plugins to be set in wp-cli.yml
tests for skip-plugins flag
Merge pull request #1062 from trepmal/skip-plugins-global

allow --skip-plugins to be set in wp-cli.yml
remove duplicate --skip-plugins tests and move to separate file

see #1062
removing block comments
Merge pull request #1074 from szepeviktor/patch-1

removing block comments