Merge pull request #3 from MartinKuhl/master

Fix mobile and fax sub-model // rebrand

[LIBSDK] Update README.md

[LIBSDK] update of version and readme from 0.9.3 to 0.9.3.1

[LIBSDK] update of version and readme from 0.9.2 to 0.9.3

[LIBSDK-11] add direct-debit frontend examples

Exclude ratepay_credentials.php from git