Merge tag '0.3.0' into develop

0.3.0
Now orgbox works in org-mode (not only org-agenda).
Merge pull request #8 from yasuhito/feature/schedule-in-org-buffer

Now orgbox works in org-mode (not only org-agenda).
Updated descriptions.
Merge remote-tracking branch 'origin/develop' into develop
Version bump.
Merge branch 'release/0.4.0'