Move php54 file back
Remove old php54 file
Include 5.4 script independently
Persist options on deactivation, drop only on uninstall
Merge pull request #25 from mpeshev/mp54ext

Move back the PHP 5.4 improvements file to /inc
Merge pull request #26 from mpeshev/mpdeactivate

Persist options on deactivation, drop only on uninstall