Updated package.json and bower.json

### Updated bower.json
    
- updated package versions
- bumped bokeh.js to to 0.4.4
- changed dependencies to devDependencies

### Updated package.json
    
- use the default ^ instead of ~ for version numbers
- updated package versions
- bumped bokehjs to 0.4.4
- changed dependencies to devDependencies for more semantic usage

### Build Status badge
- Build passing / failing badge in bokeh/README.md

### Revised README

### Moved bower.json to `docs`