file plugin async additions
minor factorization
Make max concurrent downloads configurable.
Use UIImage.FromFile instead of reading from the file store into memory because it's faster.
Set AutocorrectionType on the UITextField if it has been created.
Merge pull request #696 from ddunkin/dialog-autocorrect-fix

Set AutocorrectionType on the UITextField if it has been created.
Fixed binding bug:

Object type System.DateTime cannot be converted to target type:
MonoTouch.Foundation.NSDate
Update to latest nuget.
Pack PDBs along with DLLs.

Packs PDBS and generates .symbols.nupkg files
suitable for symbolsource.org.

See: http://docs.nuget.org/docs/creating-packages/creating-and-publishing-a-symbol-package
Merge pull request #712 from kjeremy/nuget

#314 Source package
PictureChooser added - fixes #710
Remove incorrect event reflection - fixes #707
Merge pull request #705 from Costo/uidatepickertimetargetbinding-bug

Fixed binding bug in MvxUIDatePickerTimeTargetBinding
Changes to allow CommandParameter to operate in Tibet style
Merge branch 'v3.1' of github.com:slodge/MvvmCross into v3.1
Merge pull request #691 from ddunkin/v3.1

Performance improvements for DownloadCache plugin.
Merge branch 'v3.1' of github.com:slodge/MvvmCross into v3.1
Follow ups to #691
Additional methods added - addresses #689
Button states - fixes #688