v0.9.3rc4

Bugfixes:

- FED: correct station-xml MIME
- FED: `level=response&format=xml`
- FED,STL: allow ASCII chars for net,sta,cha

Features:

- FED: Add user-agent to request (#36). Thanks to @Jollyfant for PR.
- STL: make use of WAL PRAGMA
- FED,STL: Enhanced sphinx API docu.
- Provide docker image at DockerHub.
- Changed versioning scheme. Using release candidates from now on.

v0.9.2.2: patches and minor improvements

Patches:
  - FED: default endtime must not be static
  - FED: *nodata* is not forwarded to endpoints
  - STL: update lastseen parameter correctly
  - FED, STL: Content-Type is text/plain
  - FED, STL: propagate exceptions to mod_wsgi

Improvements:
  - FED: configurable threads/resource at CLI
  - STL: level reduction implemented
  - STL: application.wadl

v0.9.2.1

bugfixes: fed: corrected result processing

v0.9.2

eida-federator: granular endpoint requests; streaming