Merge branch 'hotfix/49'

Close #49
Fix paginator first page link
Passing a null value for the first hal link page parameter.
Merge pull request #50 from baptistecosta/master

Possible issue on HAL collection first link of the paginator.
[#50] Wrote unit test

- Ensure "first" link does not contain pagination information
Merge branch 'hotfix/50' into develop

Forward port #50