This class is a utility to make easier the instalation and use of jcrontab
What it does is to create the default files "jcrontab.properties" and
"crontab" and set a default initial properties ready to work in any system
The reason why this class was added was to make it easier to integrate with
Returns the only instance of this class
we've choosen a singleton pattern to avoid launch different Crontab
If you need diferent crontab classes to be launched only should
Change the private constructor to public.
This class sends an email to the given address every time a task ends
This class does exactly the same as the directive MAILTO extension in
Sending an email has a strong limitation:
The log you receive by mail can be confused in multithreaded tasks or
if you have more than two tasks running at the same time.