Added initial fixture.

Creates moderator group.
Adds four questions.

"./bin/django loaddata fixture_name" will load the data.
Made modifications.

initial_fixture only to add moderator group.
sample_question file modified to add language and snippet.
Command 'add_group' created for adding the moderator group
Removed space
Merge pull request #33 from prathamesh920/initial_fixtures

Added initial fixture.