convert indentation to spaces for all files

spaces and tabs were used both in the same files, causing things
to look weird. This fixes that
Merge pull request #1 from DefactoSoftware/fix-indentation

convert indentation to spaces for all files
Fix createPerson method
Fix createSubscription method
Add get courses method
Extend api test page and remove hardcoded id's
Add course template subscriptions to SDK
Add some conditions to API test page
Add methods by @pjgoris
Add method getPersonByUsername
Make SSO use username instead of e-mail
Update capp_api_calls with changes from @pjgoris
Remove unnecessary require