[WIP] Calendars export to other devices (issue#824)

[Seal98]

Creating a servlet that allows external programs to subscribe to the Sigmah calendar using URL

[osarrat]

Hi @Seal98,

Great to see so much work on this issue #824 ! Looking forward to the demo tomorrow ! A quick feedback on commit presentation:

• no need to start your commit message with "[WIP]" : the "[WIP]" marker is only for the Pull Request title globally, not for individual commits
• important: add a space when typing "issue #824" in your commit title: typed as you did it, it won't be recognized by Mantis

See you tomorrow !

[ghost]

At first sight, this can't be merged without a global clean-up (altered license headers, personal settings in pom.xml, offline mode disabled...).

[osarrat]

Thanks @numero-six for this review ! @Seal98 , do you feel you can do those necessary changes in order to merge your pull request ? Could you by the way also merge your two pull requests which both impact the calendar ?