Fix typos in the comments for PadListExpansions

New feature: PadListExpansions - reduces query plan saturation by padding "in" lists and populating with nulls; opt-in (see remarks on setting)

Initial test setup for #461; note that this does not repro, due to running on SQL-Server - needs to be changed to SQLite to repro

actual/expected in asserts are the wrong way round

All the tests are wrote in the form actual.IsEqualTo(expected). This
made for some odd error messages when a test failed.

Class libraries should target net451 rather than dnx451, according to this: aspnet/Announcements#98

Also updated global.json to use DNX v1.0.0-rc1-update1

Add ApplyNullValues setting / implementation - makes it assign (rather than ignore) null values when possible; also nameof *all the things*; well... most of them

Fix small typo in contrib

default was misspelt as defualt

Make use of delegate variance, so the actual delegate stored is a Func<IDataReader, YourType>; this makes it possible to efficiently expose GetRowParser<T> without any extra allocations

New IDataReader APIs: GetRowParser, Parse; add cache around GetTypeDeserializer that is unrelated to the query itself (just dependent on the shape of the results)

remove the lie that "binding code is only interested in names - not types"; it might have been true once, but not for a long time

Added checks to make sure that arrays get the appropriate type when d…

Snapshotter now supports private properties.

Private properties can serve as helpful passthroughs to more complex
public properties.  SqlMapper honors private properties when mapping
properties, so it seems natural for Snapshotter to follow suit on the
'get' side of things within the Dapper ecosystem.