Bugfixes and maintenance

Bug fixes

* Update OpenIOC import
* Improve tagging
* Make add_attribute more generic

Bugfixes and improvments

* Add methods for managing servers
* Fix filenames with containing regexes
* Update allowed types
* Bugfixes

Add generic tagging method.

Bug fixes.

Fix regression

Bugfixes

Many upgrades to sync with MISP.

* Attribute level tagging
* Disable correlation
* Organisation managment
* Add attachments to events
* Add search by UUID
* Mark attributes as deleted
* Better version check

Multiple changes

* Add support for attachments & malware sample
* Add initial GPG signing support to MISP Events
* Allow to change the to_ids to an attribute via UUID
* Improve STIX converter
* Improve test cases
* Add initial Galaxy support
* Cleanup & bugfixes

Add tools for importing OpenIOC and STIX, bugfixes.

Major refactoring, add MISPEvent and MISPAttributes classes.