Fixed inactive course enrollment filtering

Fixed showing only enrolled users (#35)

* Fixed showing only enrolled users

* Bumped version

* Addressed comments

* Addressed comments again

* Addressed comments once more

* Fixed unfixable

* Refactored again

* Removed obsolete funtion

* Fixed minor unnecesary variable initialization

* Refactored some more

* Force anonymus user id creation and refactored

Display scores as floats.

Merge pull request #37 from ExtensionEngine/vkaracic/NDPD-1242

NDPD-1242: Display scores as floats.

Show appropriate message for empty submissions.

Merge pull request #36 from ExtensionEngine/vkaracic/NDPD-1253

NDPD-1253: Show appropriate message for empty submissions.

Check for score before creating empty submission

Merge pull request #34 from ExtensionEngine/vkaracic/NDPD-1254

NDPD-1254: Check for score before creating empty submission.

Update previous CSMs on weight update

Merge pull request #33 from ExtensionEngine/vkaracic/NDPD-1235

NDPD-1235: Update previous CSMs on weight update.

Create empty submission when no due date.

Merge pull request #32 from ExtensionEngine/vkaracic/NDPD-1223

Create empty submission when no due date.

Add a general error message.

Merge pull request #31 from ExtensionEngine/vkaracic/NDPD-1245

Add a general error message.

Allow grading if no due date

Merge pull request #30 from ExtensionEngine/NDPD-1223

Allow grading if no due date.

Allow grading past due for nonsubmitted

NDPD-1223: Allow zero grade and grading unsubmitted past due (#29)

* Change enter grade element to button.

* Allow zero grade.

* Allow grading after due past.

* Disable grade button if not passed due and not submitted.

* Version bump

Remove grade display for not published or graded instances

Merge pull request #28 from ExtensionEngine/vkaracic/NDPD-1226

NDPD-1226: Remove grade info if not graded and published.