Take care of #46, #47, #48 - Add sysopsis, promise/packaged_task/async and adapt the General section from the Fundamental TS.
Merge remote-tracking branch 'real_concurrency_ts/master'
Merge remote-tracking branch 'real_concurrency_ts/master'
Addressing issue #59 - Add make_exceptional_future.
Merge pull request #60 from viboes/master

 Addressing issue #59 - Add make_exceptional_future.