Reoganize styles

This is a laundry list of changes that will crash your github...

#### CSS Changes
+ delete treegrid
+ rename inspector files
+ remove link tags
+ removed unused bootstrap files
+ remove elementsSidebar.css which was legacy from the backbone-debugger
+ replace data attribute selectors with classes

#### new filetree
```
css
├── Images
│   ├── statusbarButtonGlyphs.png
│   └── statusbarButtonGlyphs_2x.png
├── agent.css
├── bootstrap3.css
├── inspector
│   ├── main.scss
│   └── partials
│       ├── _activity-panel.scss
│       ├── _data-panel.scss
│       ├── _header.scss
│       ├── _panel-list.scss
│       ├── _tree-view.scss
│       ├── _ui-panel.scss
│       └── inspector
│           ├── _inspector-panel.scss
│           ├── _inspector-sidebar.scss
│           └── _inspector.scss
├── marionette_inspector.css
└── marionette_inspector.css.map
```

#### old filetree
```
css
├── Images
│   ├── statusbarButtonGlyphs.png
│   └── statusbarButtonGlyphs_2x.png
├── agent.css
├── bootstrap.css
├── bootstrap.min.css
├── bootstrap3.css
├── elementsSidebar.css
├── inspector
│   ├── main.scss
│   └── partials
│       └── _data-panel.scss
├── inspector-sidebar.css
├── inspector.css
├── jquery.treegrid.css
├── marionette_inspector.css
├── marionette_inspector.css.map
└── panel.css

```
This was from the backbone debugger days when there was an elements sidebar