Add ftdetect script for detecting Perl 5/6
Add filetype detection for .nqp files
Test comments following postfix dereferences
Fix highlighting after postfix dereferencing
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  Fix highlighting after postfix dereferencing
  Test comments following postfix dereferences
  Add filetype detection for .nqp files
  Add ftdetect script for detecting Perl 5/6