Bugfix/issue 688 ordered logistic rng

#### Summary:
Fixes issue #688 so ordered_logisitc_rng now returns K too (in addition to 1 to K-1).

#### Intended Effect:
ordered_logisitc_rng now returns K too (in addition to 1 to K-1).

#### How to Verify:
Modified test for this rng so that it has large enough expectation for each return value (so it failed with previous code).

#### Side Effects:
None.

#### Documentation:
No changes just thanked Matius in acknowledgements.

#### Reviewer Suggestions:
Anyone.