Trailing slashes in baseUrl

[Mario Holtmüller]

The baseUrl that is used throughout the restclient needs to handle trailing slashes. It must not matter if the given URL has a trailing slash or not. The restclient should handle that itself.

For example using OAuth requires a trailing slash. Using BasicAuth not.

[Florian Fassing]

Quickfix for OAuth Adapter with 4c4597f. RestClient still needs to be made entirely independent from trailing slash existence.

[Kevin Choong]

Resolved in 3952c61