Add DateTimeOffset support for BackgroundJob.Schedule methods

Closes #237
Fix test method to use the same time
New double value for JobArgumentFacts
New Single value for JobArgumentFacts
Fix some tests for mono
Update JobArgumentFacts.cs
Update JobArgumentFacts.cs
Add release notes for 1.3.0
Update Hangfire.Build dependency to 0.1.3
Log exceptions correctly with LibLog
Add automatic ElmahLogProvider
Expose ServerWatchdogOptions through BackgroundJobServerOptions

Closes #276
Increase default ServerTimeout value to 5 minutes
Add moar release notes for 1.3.0
Updated to coming LibLog 2.0.0 with simplified interface
Hangfire.CompositeC1 project link added
Merge pull request #277 from burningice2866/patch-1

Hangfire.CompositeC1 project link added