[BUGFIX] Create SkillSet entity from array

[FEATURE] Add endpoint for skillset list

[TASK] Throw exception if required API key is missing

Merge pull request #14 from SkillDisplay/organisation

Added new Entities (Organisation, MemberSkills and SkillSetProgress)

[FEATURE] Support includeFullSkills for SkillSets

Fixes: #10

[BUGFIX] Fix tests

[BUGFIX] Use correct base URL for media

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

…ampaigns-api

Allow json decode of received campaigns response

[TASK] Fix indentation

Merge pull request #6 from DanielSiepmann/feature/provide-entity-getter

Add brands