[sql-lab] ui polish (#1079)

* we don't need tooltips on accordion menu, known ui pattern

* use consistent type sizes, bump body type down to 14px

* make editor same height as 3 selects

* table meta data accordion menu

- prevent default on accordion clicks
- always show table actions, they are more discoverable like that
- polish spacing/layout

* remove hover effect on table actions

caravel/assets/javascripts/SqlLab/components/SqlEditor.jsx

@@ -260,7 +260,7 @@ class SqlEditor extends React.Component {
                   mode="sql"
                   name={this.props.queryEditor.id}
                   theme="github"
-                  minLines={5}
+                  minLines={7}
                   maxLines={30}
                   onChange={this.textChange.bind(this)}
                   height="200px"