Fixes some problems with the UIWebView renderer.
Merge pull request #449 from wordpress-mobile/issue/430-black-borders

Fixes some problems with the UIWebView renderer.
Add methods to show and hide failure icon and message when a image upload fails.
Show retry icon before message.
Adjust message font size and position.
Do correct check for element presence in JQ.
Remove id after upload is done.
Merge pull request #450 from wordpress-mobile/issue/348_361_Retry_failed_media_uploads

Issue/348 361 retry failed media uploads
Fix id removal process.
Merge branch 'issue/348_361_Retry_failed_media_uploads' into develop
Cannot remove ids this way because of racing condition.
Merge branch 'issue/348_361_Retry_failed_media_uploads' into develop
Adds paragraph around images to allow selection of images while uploading.
Don't allow remove by using selection on failed image.
Merge branch 'issue/348_361_Retry_failed_media_uploads' into develop