Merge branch 'development' into fix/docLinks

* development:
  Update and standardize contracts README
  Add to CHANGELOG
  Refactor toBaseUnitAmount so that it throws if user supplies unitAmount with too many decimals
  Make assertion stricter so that one cannot submit invalid baseUnit amounts to `toUnitAmount`
  Add some missed underscores, update changelog and comments
  Add new underscore-privates rule to @0xproject/tslint-config and fix lint errors

# Conflicts:
#	packages/website/ts/pages/documentation/documentation.tsx
#	packages/website/ts/pages/shared/nested_sidebar_menu.tsx

packages/website/ts/pages/documentation/event_definition.tsx

@@ -30,8 +30,8 @@ export class EventDefinition extends React.Component<EventDefinitionProps, Event
                 id={`${this.props.sectionName}-${event.name}`}
                 className="pb2"
                 style={{overflow: 'hidden', width: '100%'}}
-                onMouseOver={this.setAnchorVisibility.bind(this, true)}
-                onMouseOut={this.setAnchorVisibility.bind(this, false)}
+                onMouseOver={this._setAnchorVisibility.bind(this, true)}
+                onMouseOut={this._setAnchorVisibility.bind(this, false)}
             >
                 <AnchorTitle
                     headerSize={HeaderSizes.H3}
@@ -42,14 +42,14 @@ export class EventDefinition extends React.Component<EventDefinitionProps, Event
                 <div style={{fontSize: 16}}>
                     <pre>
                         <code className="hljs">
-                            {this.renderEventCode()}
+                            {this._renderEventCode()}
                         </code>
                     </pre>
                 </div>
             </div>
         );
     }
-    private renderEventCode() {
+    private _renderEventCode() {
         const indexed = <span style={{color: colors.green}}> indexed</span>;
         const eventArgs = _.map(this.props.event.eventArgs, (eventArg: EventArg) => {
             const type = (
@@ -78,7 +78,7 @@ export class EventDefinition extends React.Component<EventDefinitionProps, Event
             </span>
         );
     }
-    private setAnchorVisibility(shouldShowAnchor: boolean) {
+    private _setAnchorVisibility(shouldShowAnchor: boolean) {
         this.setState({
             shouldShowAnchor,
         });