Solution clean up (mostly tests)

/src
- Renamed FluentColumnList`1.cs => FluentColumnList.cs
- Renamed CassandraColumnFamily+QueryProvide.cs =>
CassandraColumnFamily.cs
- Renamed TimedLock.cs => LockTimeoutException.cs

/tests/*
- Integration tests that require a running database are now moved to
FluentCassandra.Integration.Tests
- Removed app.config file from unit tests, no need for cassandra db
config in that project
- Cleaned up references, removed unused ones
- Removed unused usings and sorted used ones
- Updated xunit package to the latest version

Ignore *.DotSettings added