Some pending issues in the working group implementation.

• Better initial configuration of a mint for the working group - fix: content working group: create mint and optionaly lead at genesis #119

• update_channel_as_owner doesn't use parameter new_channel_name when calling update_channel() - fix fix update_channel_as_owner to use new_channel_name #118
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• apply_on_curator_opening() - Origin doesn't prove that it controls source account from which funds will be staked. - fix apply_on_curator_opening() source_account must be controlled by member #121
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• unstaked is implemented as a privileged method (can be invoked by sudo key via extrinsic) which isn't correct. It should just be a normal method - fix content working group: make unstaked() an non dispatchable #120
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• fill_curator_opening doesn't setup a reward relationship - fix Create recurring reward relationship for curator when filling role #123