There is an error in one of your plugins called “instapress”.
The last update to this plugin was 14 months ago. The support forum has one reply in the last month.
First disable this plugin by renaming its directory using either FTP or your website management console file manager. This will get you going again.
I googled “Call-time pass-by-reference has been removed” and find that this is about a feature that was in php ver 5.3 but removed in 5.4
If you can revert to php ver 5.3 then you could still run your website.
OR If you want to hack your plugin, this article shows you that the trick is to remove the & in an argument to a function on line 306
http://stackoverflow.com/questions/8971261/php-5-4-call-time-pass-by-reference-easy-fix-available
There may be other lines too, 306 is just the first one.
The configuration of your new web host is breaking the plugin Instapress which if you look on its support forum:
https://wordpress.org/support/plugin/instapress
looks like its a compatibility problem with PHP5 see:
https://wordpress.org/support/topic/fatal-error-1173?replies=8
