DeleteFile should not throw FileNotFoundException

It doesn't throw on Android or iOS (File.Delete default behavior).
file plugin async additions
minor factorization
Use the tel uri in windows store for phone calls

This is handled by Skype but not Skype specific (RFC3966).
Merge pull request #678 from guillaume-fr/patch-2

Use the tel uri in windows store for phone calls
reinstate the phone plugin for winrt
Merge pull request #671 from guillaume-fr/patch-1

DeleteFile should not throw FileNotFoundException
Allow null image binding for reset to empty image
Merge pull request #680 from iseebi/MvxImageViewLoading

Stil display older image in MvxImageView (iOS) when loading and DefaultImagePath not present
Make max concurrent downloads configurable.
Use UIImage.FromFile instead of reading from the file store into memory because it's faster.
SafeDeleteFile should return true if file doesn't exists

TryMove fails when deleteExistingTo is true and there is no existing file.
SafeDeleteFile should return true if the file doesn't exists.
WindowsStore MvxPhoneCallTask doesn't compile

My bad, I messed up with the argument name in my last pull request
Merge pull request #690 from guillaume-fr/patch-4

SafeDeleteFile should return true if file doesn't exists
Merge pull request #692 from guillaume-fr/patch-5

WindowsStore MvxPhoneCallTask doesn't compile
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