Raised PHP compatibility

Also added more endpoints and entities

Add more API options

It is now possible to query SkillSets including the associated Skills.
Verifications can now be triggered without auto-confirmation.

Bugfix release

Use correct path for images from SkillDisplay

Bugfix release

Merge pull request #8 from DanielSiepmann/bugfix/type-missmatch-for-c…

…ampaigns-api

Allow json decode of received campaigns response

Add campaign support

v1.2.0

[TASK] Fix indentation

Re-introduce brand logo

Reintroduces the brand logo

v1.1.0: Merge pull request #4 from DanielSiepmann/bugfix/skillset-verificatio…

…n-url

Fix wrong verification link for skillsets