Closes#556
* New Ghost Logo Icon
* New Lightning Icon for plugins screen
* Remove old Ghost Logo Icon
* Moved #ghost to .ghost-logo to clean up conflicts with editor, previously fixed with dodgy overnesting
- This is a first pass at getting a more logical structure. The focus is on moving from admin/frontend to client/server.
- The location of the databases is highly important, this isn't expected to change again
In the future
- client/assets should probably become public/
- more stuff should be shared (helpers etc)
- cleanup some confusion around tpl and views