Update wkhtml download link

Since the current link at dna.org is dead. http://downforeveryoneorjustme.com/http://download.gna.org

odoo_install.sh

@@ -38,8 +38,8 @@ OE_CONFIG="${OE_USER}-server"
 ## === Ubuntu Trusty x64 & x32 === (for other distributions please replace these two links,
 ## in order to have correct version of wkhtmltox installed, for a danger note refer to 
 ## https://www.odoo.com/documentation/8.0/setup/install.html#deb ):
-WKHTMLTOX_X64=http://download.gna.org/wkhtmltopdf/0.12/0.12.1/wkhtmltox-0.12.1_linux-trusty-amd64.deb
-WKHTMLTOX_X32=http://download.gna.org/wkhtmltopdf/0.12/0.12.1/wkhtmltox-0.12.1_linux-trusty-i386.deb
+WKHTMLTOX_X64=https://downloads.wkhtmltopdf.org/0.12/0.12.1/wkhtmltox-0.12.1_linux-trusty-amd64.deb
+WKHTMLTOX_X32=https://downloads.wkhtmltopdf.org/0.12/0.12.1/wkhtmltox-0.12.1_linux-trusty-i386.deb
 
 #--------------------------------------------------
 # Update Server