Hangfire.Core 1.3.4

https://github.com/HangfireIO/Hangfire/releases 1.3.3 * Fixed – Enqueued job is not being processed with MSMQ or RabbitMQ. 1.3.2 * Fixed – Fatal error occurred during execution of 'Server Core' component. * Fixed – Hangfire version freezes at 1.1.3.4 on Dashboard. * Fixed – Recurring job does not trigger. 1.3.1 * Fixed – Worker stops processing on storage exceptions. 1.3.0 * Added – Generation of NuGet symbol packages with `*.pdb` and source files. * Added – Allow to customize serialization settings of Json.NET (by @fpellet). * Added – Ability to configure `ServerTimeout` option. * Breaking – Use `LibLog` package instead of `Common.Logging` for logging. * Changed – Use ILMerge instead of ILRepack (found there is a NuGet package for it). * Fixed – Dashboard not crash if a scheduling task is cancelled (@fpellet).