Merge branch 'master' into develop
Improve caching prevention for avatar images

Closes #54.
Merge branch 'develop' of github.com:dellsystem/phpBB-dynamic-avatar into develop
Update install.xml (bumped to v0.9.2)
Add v0.9.2 to UMIL install file (no changes)
Merge branch 'master' of github.com:dellsystem/phpBB-dynamic-avatar
Merge branch 'develop'