Merge pull request #13 from aseques/calculated_date

Merge pull request #14 from aseques/long_name

Upped file name lenght to 100 characters

Fix error when exporting a calculated field type date

Merge pull request #12 from aseques/undefined_check

Made the undefined vars check more generic

Merge pull request #11 from aseques/help

Merge pull request #10 from aseques/master

Allow the usage of -h for the help

Error out when variable backupTo is undefined

added reference to https://www.cloud-backup-for-podio.com

Update README.md

Update README.md

rework for podio-php v4.0

adaptation for podio-php v4.0: PodioCollection