Update SitecoreService.cs

Begin/EndEdit is called twice. Once in Create<T, K> and once inside WriteToItem. We sometimes (!?) get exception "Exception: Sitecore.Exceptions.EditingNotAllowedException Message: Item 'XX' is not in editing mode." when second EndEdit is called after returning from WriteToItem.

Implementation of sitecore Begin/EndEdit does no look like it is meant to be called in such nested way (there is no counter for nested calls, first EndEdit ends editing mode). However it is very strange that mostly it works, we didn't figure out what is different when it throws this exception. But once it throws it, it throws it consistently.
Addition of new property to the UmbracoChildren attribute to allow mapping of different node types as children.
sorting out files in nuget packages
empty enum field not returns default enum
fixing for issue 61

https://github.com/mikeedwards83/Glass.Mapper/issues/61
Merge pull request #60 from dufkaf/patch-1

SitecoreService.cs - Begin/EndEdit is called twice.
Merge pull request #65 from drachele/develop

Addition of new property to the UmbracoChildren attribute
work to make placeholders work in Glass.Mappr.Sc.Razor simpler
fixing mvc reference in sitecore config
Check for null property objects.
Merge pull request #68 from acastr7/develop

Check for null property objects.
Fix WebActivatorEx
default values for mappers and fix to rendering parameters for Razor files in mVC
Merge branch 'develop' of github.com:mikeedwards83/Glass.Mapper into develop
Fix for issue 72

https://github.com/mikeedwards83/Glass.Mapper/issues/72
removing the obsolete attribute  for SitecoreAttributeConfigurationLoader
Amend sorting logic

Need to amend sorting logic as it will default to 0 and therefore break if you want to override it.
remove upgrade project from sitecore release
Merge branch 'develop' of github.com:mikeedwards83/Glass.Mapper into develop
removed upgrade project from release solution