stored ps.txt in archive to preserve timestamp, modified tests to handled a compressed text file, fixed the plugin name in the presets.

Author: rick

plaso/data/presets.yaml

@@ -27,7 +27,7 @@ parsers:
 - sqlite/ios_screentime
 - sqlite/kik_ios
 - sqlite/twitter_ios
-- text/apple_pstxt
+- text/apple_ps_txt
 - text/ios_lockdownd
 - text/ios_logd
 - text/ios_sysdiag_log
@@ -90,7 +90,7 @@ parsers:
 - sqlite/mackeeper_cache
 - sqlite/mac_knowledgec
 - sqlite/skype
-- text/apple_pstxt
+- text/apple_ps_txt
 - text/bash_history
 - text/gdrive_synclog
 - text/mac_appfirewall_log