Merge pull request #5 from hmbr/master

pt_BR
Updated French translation
Updated Dutch translation
Remove error_strings function prototypes from script_functions header
Use EXIT_FAILURE constant instead of 1
Remove if-case braces
Update date in the manpage
Make sure po folder is made using -j1, otherwise build fails
Fix make -j usage
Updated Russian translation
Merge branch 'master' of https://github.com/rshadow/devilspie2
Update Changelog
Mention -j builds in changelog
Update version number
Working on the 0.26 version
Add 'center' function
Another error message related to the 'center' code
Update Swedish translation
Remove commented function prototype
Add a text file describing development details