Added support for parsing properties from a file.

--properties-file filename will parse the properties file and set the appropriate fields.
Added support for multiple properties files.
Now multiple properties can be set by "--properties-file file1.txt --properties-file file2.txt"
or it can be "--properties-file file1.txt;file2.txt"
Removed the replacing of '.' with '-' as JOptSimple supports '.' in options.
Merge pull request #130 from torfredrik/master

Added support for properties+file used for loading arguments from a file.
To load a single file:
 "--properties-file file.txt"

This loads properties from a properties file instead of having to declare them on the command line.

To load from multiple property files multiple --properties-file arguments are supported or ";" seperated list:
"--properties-file file1.txt --properties-file file2.txt" 
-- OR --
"--properties-file file1.txt;file2.txt"

No regard to collision is taken between the files.