Fixes a problem with a black box that was showing up in the editor.
Removes some duplicated code.
Images the fail to download still replace the src attribute.
Merge pull request #369 from wordpress-mobile/issue/365-swap-images-on-download-failure

Images the fail to download still replace the src attribute.
Merge pull request #368 from wordpress-mobile/issue/318-black-box-in-editor

Fixes a problem with a black box that was showing up in the editor.
Exposed the placeholder text for title and content...

...as a public property which can be modified after the editor is setup.
Updated placeholder setter logic
Merge pull request #378 from wordpress-mobile/issue/373-page-placeholder

Exposed the placeholder text for title and content...
Merged from release/0.2.3