replace editor with tabbed-panel
Fixup keymap, saving/opening etc.'
Editor: scroll to bottom of post buffer after posting
Editor: add missing functionality

- basic command to open source files for symbol
- command to close tabs
Merge branch 'tabbed-editor'

- enable editing of multiple files
- add lookup functionality for source code
Make project runnable.

- add main class to core namespace
- tell leiningen where it is
Misc. optimizations and documentation improvements
Add tutorial and example instruments.

- Editor: add Help menu entry for example instruments
- ReadMe: add brief note on usage