updated linux df comand, use cmdDf, new regex

I changed the df comand to get addtional information. With the output param from df you can add additional informations. (found this information in linux comand: "info coreutils 'df invocation' ") Its nice to know the filesystem type too. Because of that i changed the regex and added "type" to the "infos" object.
Also i fixed the use of the cmdDf variable as requested before.
added compatibility for Darwin

Added additional regex and if for splitting linux and darwin.
fixed syntax error
renamed regex
Merge pull request #3 from Fitnerd/master

updated linux df comand, use cmdDf, new regex