v0.7.0 release (includes 0.6.0 improvements!)

Improvements in this release:

v0.7.0 improvements:

• Add switcher to allow for multiple topics in UI

v0.6.0 improvements

• Allow chat topic to be associated with a particular group (so that only group members can see it)
• Add admin level customization for composer placeholder / babble icon
• Add additional translations
• Set max size for chat topics (delete old posts as new ones come in)