pdfgroup 0.0.2 released

Version 0.0.2

If no input or output files are selected group button isn't clickable
File -> Exit just work.
Click on Cancel buttons just works.
Use of global variable to store files instead of local variables.
Some variables had changed it's name or has been translated.
Label shows the number of pdf files to group instead of the path of all files.
Renamed pdfsnambler.py and pdfsnambler.glade to pdfgroup.py and pdfgroup.glade