Fixed access level of BoxEnterprise Entity
Added permission and sort order entities
Fixed serialization of recursive boolean in FolderManager.DeleteAsync
Added Apache License
Added ability to download a particular version
Merge branch 'groups_api' of https://github.com/alitaleg/box-windows-sdk-v2 into alitaleg-groups_api

Conflicts:
	Box.V2/Box.V2.csproj
Merge branch 'master' of https://github.com/ckapatch/box-windows-sdk-v2 into ckapatch-master
Updated fields to be consistent with current SDK
Merge branch 'oauth_example' of https://github.com/alitaleg/box-windows-sdk-v2 into alitaleg-oauth_example
Merge branch 'oauth_example' of https://github.com/alitaleg/box-windows-sdk-v2 into alitaleg-oauth_example