Logger.log and Logger.info output to LogSeverity.INFO not LogSeverity…

….DEBUG

Automatically adds Stackdriver logging and logging via custom functions

Get a lock object before getting the lock. Fixes peterherrmann#17

Added a Lock to the critical section where the log is rolled over aft…

…er hitting SHEET_MAX_ROWS. Fixes peterherrmann#15

Added a Lock to the critical section where the log is rolled over

 after hitting SHEET_MAX_ROWS. Fixes peterherrmann#15

Added a Lock to the critical section where the log is rolled over

 after hitting SHEET_MAX_ROWS. Fixes peterherrmann#15

Merge pull request peterherrmann#14 from markgitset/master

Fixed argument stringification for undefined arguments

Logged objects are now stringified. Fixes peterherrmann#12.

Version 18 plus fixes peterherrmann#10