REL: Preparing version 0.9.4

Switching version and status strings over to 0.9.4 and to Release.
Update ChangeLog.md
Merge pull request #297 from ElDeveloper/0.9.4

REL: Emperor 0.9.4 release
MAINT: Change status and version strings
DOC: Update ChangeLog.md
Merge pull request #298 from ElDeveloper/0.9.4-dev

REL: Update to verson 0.9.4-dev