Added a couple more HttpRequest* Enrichers

Contains Client IP, -Hostname, User Agent, (Raw) Url, Referrer and
Request Type. Never hurts to have a little extra options and info at
hand.
Updated HttpRequestClientHostIPEnricher to also check for proxies, if available
Fixed typo in code comment. meh.
Added option to en-/disable HTTP Proxy Check
Added batching sink for Azure table storage
 - Changed configuration to be inline with other sinks
 - Use min timestamp as partition key
Add batch row id to RowKey to ensure uniqueness
Prevent duplicate partition keys
Merge branch 'master' of https://github.com/jbattermann/serilog into jbattermann-master
Merge branch 'jbattermann-master'
Merge branch 'master' of https://github.com/mcintyre321/serilog into mcintyre321-master
Couple of minor tweaks to keep R# happy, provide batching for other AzureTableStorageSink overload.
Merge branch 'mcintyre321-master'
Picked up a couple of ReSharper warnings in Serilog.Sinks.Splunk.