Update Rich Text Editor 3247, 3260, 3291, 3554, 3781, 3849

- 3260 Rich Text Editor (RTE) needs double justify and right justify buttons http://code.google.com/p/otwarchive/issues/detail?id=3260

- 3291 Rich Text Editor (RTE) creates broken links to works on the Archive http://code.google.com/p/otwarchive/issues/detail?id=3291

- 3781 Instructions don't toggle when switching between RTE and HTML editor
http://code.google.com/p/otwarchive/issues/detail?id=3781

- 3849 With Chrome and Safari, deleting the space between two paragraphs in the RTE causes the font of the second paragraph to become small http://code.google.com/p/otwarchive/issues/detail?id=3849

- Browser spell check doesn't work in RTE (no issue, just something I noticed was broken)

It also sort of fixes:
- 3554 RTE Align Left button does not work, creating code that is stripped by the parser http://code.google.com/p/otwarchive/issues/detail?id=3554

However, if you use the center tag in the HTML editor and switch to the RTE, you cannot use the alignment buttons to remove it. This is because I told the RTE to use the align attribute, which means it will not affect the center tag. So use align="center" instead of the center tag if you plan on switching from the HTML editor to the RTE for the purpose of using its alignment options. (It's probably not entirely unfixable, but I haven't gotten quite that invested.)

It may fix but I cannot test:
- 3247 Centre button in RTE does nothing in Safari 5.0.4 http://code.google.com/p/otwarchive/issues/detail?id=3247

- 3253 Anomalies pasting some types of formatting from Word into the RTE http://code.google.com/p/otwarchive/issues/detail?id=3253

- 3257 Rich Text Editor not recognizing formatting on text from Windows RTF editors http://code.google.com/p/otwarchive/issues/detail?id=3257

- 3267 Rich Text Editor (RTE) stripping formatting when pasting with certain combinations of browser, operating system, and word processor http://code.google.com/p/otwarchive/issues/detail?id=3267

~~This also adds a button for video embeds, as discussed in the AD&T e-mail thread "Update RTE?" from 11 August 2013. If you look at the [example editor on the TinyMCE site](http://www.tinymce.com/tryit/full.php), there are two tabs in the Insert/Edit Video popup. The General tab is geared toward uploads, which isn't something we offer. The Embed tab is where you paste the embed code just like you'd paste it into our HTML/plain text editor. Naturally, there's not a way to configure TinyMCE to only use the Embed tab on the Media plugin.~~

One more thing: there is no longer a special Paste from Word button, since pasting from Word is identical to pasting from everywhere else (this is true in our current version as well, but the button is still there). If wanted, I can add a plain Paste button (there are also Copy and Cut buttons) so we don't rely on users knowing the keyboard shortcut for pasting. I should mention that this won't actually paste anything due to browser limitations, but it will pop up a message telling users the keyboard shortcuts for pasting.