Switch to mysql2 gem for better Ruby encoding compatiblity.
Upgrade rdiscount to 2.1 series.
Add note about incompatibility with Debian/Ubuntu wkhtmltopdf.
Prep for version 1.3.4.
Merge tag 'v1.3.4' into oneclickorgs-com

Version 1.3.4.

* FIX Non-ASCII characters in user data would cause a runtime error under
  Ruby >= 1.9.