Make composer.phar executable.
Apply DeMorgan to HMAC expression.
Use SHA256 for HMAC comparison.
Merge pull request #1 from bantu/master

Use SHA256 for HMAC comparison.
Errm. Yeah. These are assignments.
Use a protected_labels list
Check if the label exists
change function name
Merge pull request #2 from Nicofuma/feature/protected_labels

Use a protected_labels list

* Nicofuma/feature/protected_labels:
  change function name
  Check if the label exists
  Use a protected_labels list
Update github-labels.php