Require/Disallow space before keywords

This is for #553 (old PR was #555)
It should be 0 instead of 1.  Previously it was choosing the wrong error message.  The original tests didn't catch it, so I added a test (see line 14 of test/rules/require-space-after-keywords.js). This change is unrelated to my pull request, but since I based mine on require-space-after-keywords, I found the bug and figured I'd fix it.