Use plist_parser as an alternative if xml.parsers.expat is not available
Use plist_parser as an alternative if xml.parsers.expat is not available

Said module is used by plistlib.readPlistFromString and won't work if the
module could not be imported on certain Linux dists.

Updates #19

SublimeText/PackageDev,SublimeText/AAAPackageDev,SublimeText/AAAPackageDev