renamed CategorySelect to CategoryHelper and extracted it from CategorySelect extension; modified unit tests so they pass
updated extension to use CategoryHelper instead of CategorySelect
moved extension specific logic back to the extension
changes after linting
"reverted" previous change after Kyle's comment
"reverted" previous change after Kyle's comment
fixed typos
different "fix" of an issue found by linter
Manually merge branch 'dev' into DAR-1338
manually merged origin/dev and resolved conflicts in Body_Index.php template
Merge pull request #1157 from Wikia/DAR-1338

Extracting CategorySelect.class.php from CategorySelect extension