[fix] changed exception declaration in javadoc
[task] changed visibility from token to protected to be able to extends
the accesstoken in the administration modul
[refactor] removed final to be able to mock the class
Merge pull request #66 from davidmoebius/small-refactorings

[refactore] update javadoc, delete final and visibility of token in OsiamConnector

delete final -> to have the ability mock the OsiamConnector
set token to protected -> to create a SimpleAccessToken