Update to Igor

• Adds support for DW release "Igor"
• Small changes to the curl options

fix #4

This release solves some small bugfixes.

• No irritating messages are outputed by the plugin anymore
• changed mail adress
• german translation for the settings
• re-use the curl session

v0.7.1: Fix #1

• Fixed that only nextcloud admin user can log in
• Only send request if the user really logs in