Merge branch 'hotfix/47' into develop

Forward port #47
Merge branch 'hotfix/45' into develop

Forward port #45
Merge branch 'hotfix/zf-rest-31' into develop

Forward port #39
Merge branch 'hotfix/zf-apigility-admin-190' into develop

Forward port #48
Merge branch 'hotfix/49' into develop

Forward port #49
Merge branch 'hotfix/50' into develop

Forward port #50
Merge branch 'hotfix/readme-formatting' into develop

Removes code markers from headings
Fix: Remove unused variable
Fix: Remove unused imports
Fix: Remove unused local variable
Fix: PHPDoc comments / signatures
Merge pull request #54 from localheinz/bugfixes/unused-variable

Fix: Remove unused variable
Merge branch 'hotfix/54'

Close #54
Merge branch 'hotfix/54' into develop

Forward port #54
Merge pull request #55 from localheinz/bugfixes/unused-imports

Fix: Remove unused imports
Merge branch 'hotfix/55'

Close #55
Merge branch 'hotfix/55' into develop

Forward port #55
Merge pull request #56 from localheinz/bugfxies/unused-local-variable

Fix: Remove unused local variable
Merge branch 'hotfix/56'

Close #56
Merge branch 'hotfix/56' into develop

Forward port #56