add a what's new
improve documentation around what's new in 2.5
small improvements to profiling docs
Minor spelling change

I copy pasted from here the other day trying to diagnose a problem on someone's local raven installation and discovered the command was spelled incorrectly.
Inform users that csv files should be UTF-8.

For unicode support.
replace tabs with spaces for code formatting
syntax changes for quickstart index
small edits to "Adding RavenDB to your Application"
small syntax changes to "add ravendb through nuget" doc
Small edits to "Basic Concepts"