Small improvements

* More reliable root check using [$EUID](http://stackoverflow.com/a/21622456)
* Fixed `cat` error if `administrator_eMail.txt` does not exist
* Input parameters are now case-insensitive (`--help/--HELP`)
* All TABs replaced by 4 Spaces
* EOL Conversion of all .sh files to UNIX/OSX (dos2unix)