Using the static linux binaries.

Release notes can be found here: https://github.com/wkhtmltopdf/wkhtmltopdf/releases/tag/0.12.4

Using the static linux binaries, that should work on all platforms again.

Release notes can be found here: https://github.com/wkhtmltopdf/wkhtmltopdf/releases/tag/0.12.3

Updated debian wheezy binary to version 0.12.2.1. (thx michaelperrin)

Used the Debian 7.5 compilation, because static generic linux binaries are not provided anymore by wkhtmltox.

Updated the binary to the newest available version.
For changes check: https://github.com/wkhtmltopdf/wkhtmltopdf/releases/tag/0.12.0