Instead of using spoiler boolean and spoiler_text, simply check for non-blank spoiler_text

Federate spoiler_text using warning attribute on <content /> instead of a <category term="spoiler" />
Clean up schema file from accidental development migrations

app/assets/javascripts/components/features/compose/components/compose_form.jsx

@@ -155,7 +155,7 @@ const ComposeForm = React.createClass({
 
         <div style={{ marginTop: '10px', overflow: 'hidden' }}>
           <div style={{ float: 'right' }}><Button text={intl.formatMessage(messages.publish)} onClick={this.handleSubmit} disabled={disabled} /></div>
-          <div style={{ float: 'right', marginRight: '16px', lineHeight: '36px' }}><CharacterCounter max={500} text={this.props.spoiler ? (this.props.spoiler_text + "\n" + this.props.text) : this.props.text} /></div>
+          <div style={{ float: 'right', marginRight: '16px', lineHeight: '36px' }}><CharacterCounter max={500} text={[this.props.spoiler_text, this.props.text].join('')} /></div>
           <UploadButtonContainer style={{ paddingTop: '4px' }} />
         </div>
 

app/assets/javascripts/components/features/compose/components/upload_form.jsx

@@ -12,7 +12,8 @@ const UploadForm = React.createClass({
   propTypes: {
     media: ImmutablePropTypes.list.isRequired,
     is_uploading: React.PropTypes.bool,
-    onRemoveFile: React.PropTypes.func.isRequired
+    onRemoveFile: React.PropTypes.func.isRequired,
+    intl: React.PropTypes.object.isRequired
   },
 
   mixins: [PureRenderMixin],