Updated api certificate to newly issued one.

Closes #117
Attempt at providing alignment (see #108)
Merge pull request #119 from ShawInnes/master

Updated LogEntries Cert
Stab at issue #48.
Not entirely sure how to handle backwards compatibility -- so I just added two optional parameters. But I changed the default to turn capped collection on and set to 100MB.
That wasn't a great idea. Just added a MongoDbCapped extension that handles all the additional parameters for the capped collection. Also converted the Sink to just accept the IMongoCollectionOptions which gives some additional options for unique needs. Existing API is exactly the same.
No privates allowed.
Another private slipped in there... naughty resharper.
Second go at #108
Merge pull request #123 from Jaben/master

MongoDb Sink Capped Collection Support (Issue #48)
Beefed up JsonFormatter: supports delimiting output, format providers, inclusion of rendered message. Fixes #107 and fixes #113.
Merge branch 'master' of https://github.com/mderriey/serilog into mderriey-master
Minor tweaks to factoring/project structure.
Mirrors the fix for https://github.com/continuousit/seq-releases/issues/118 to properly format decimal values in JSON regardless of culture.
Fixed the .NET 4.0 build.