Switch to using only tokens for plexupdate.sh (#169)

* Extract token fetching to extras/get-plex-token
* Have installer store TOKEN instead of EMAIL/PASS
* Provide easy way to pass git owner/branch while testing
* Use path when sourcing get-web-token
* Don't force interactive mode for EMAIL/PASS if they're already stored
* Re-enable getting plex token from server
* Try to read server token as sudo if possible
* Specify branch to clone in installer.sh
* Better checking of where token came from
* Make VERBOSE useful again
* Fix getPlexServerToken if installer.sh is being run from wget
* Extract functions into plexupdate-core
* Use plexupdate-core in installer
* Clean up usage and add --help
* Deprecate FORCEALL
* Make CHECKUPDATE check all program files
* Verify plex.tv is providing a checksum before downloading
* Add some more logging for release handling
* Use info/warn/error in plexupdate-core
* Remove outdated instructions from plexupdate.sh
* Only store tokens if PMS token is unavailable
* Warn users if fetching Plex token fails in installer
* Use local vars in functions and fix getRemoteSHA
* Update README
* Deprecate EMAIL/PASS and add token command-line option
* Quote option names
* Update FAQs
* Add link to FAQ in deprecation notice
* Remove trailing whitespace
* Make cron return 0 when plexupdate returns 10

extras/cronwrapper

@@ -58,6 +58,11 @@ fi
 if [ $RET -ne 0 ] ; then
 	# Make sure user gets an email about this (when not success or if user has specified when)
 	cat ${LOGFILE} >&2
+
+	# Output will produce a cron email, so we can reset the exit status
+	if [ $RET -eq 10 ]; then
+		RET=0
+	fi
 fi
 
 rm "${LOGFILE}" 2>/dev/null