Version 2.1.2 released

This release is mostly to fix a bug with iOS and a bug with the XHTML format.

Full changelog:

• Fixed issue with extend() trying to copy non-plain objects.
  – Thanks to @mtsnr for reporting
• Fixed issue with youtube not showing when first inserted.
  – Thanks to @zebroid for reporting and @abetis for fixing.
• Fixed iOS issue where editor didn't let go of focus.
  – Thanks to @redeye86 for reporting.
• Fixed issue with autosave plugin throwing error when two editors on the page.
  – Thanks to @q2apro for reporting.
• Fixed bug with XHTML format wrapping pasted text in <p> tags.
  – Thanks to @q2apro for reporting.
• Updated autosave plugin to clear after submitting and add clear method.
  – Thanks to @q2apro for reporting.