Fix typo in safeContextKeyword message
Extract own settings into google preset

Fixes #268
Fixes #197
Added disallowTrailingComma: disallowing the extra comma following the final element of an array or object literal.
Merge pull request #281 from kangax/master

Fix typo in safeContextKeyword message
Updated package description so as not to troll pedants
Merge pull request #289 from lennym/master

Updated package description so as not to troll pedants
Added require-trailing-comma as well as improving test coverage for disallow-trailing-comma.
Merge pull request #285 from rxin/trailingComma

Added disallowTrailingComma: disallowing the extra comma following the final element of an array or object literal.
Merge pull request #282 from jzaefferer/google-preset

Extract own settings into google preset