fixed Field parameter
Merge pull request #101 from erwinvanhunen/cmdletfixes

fixed Field parameter
Added parameter validation and helper extension in ValidationExtensions
New cmdlet
Disabled console logging when using OfficeDevPnP.Core methods
Added parameters to retrieve associated groups
Removed unused code
Removed duplicate code
Added CreateField<TField> that converts to the target field type. This enables setting properties programmatically.
Fixed AddContentTypeToList by reducing code to call existing methods
Merge pull request #103 from erwinvanhunen/newcmdlets

New Cmdlets, updated cmdlets and new validation for createtaxonomyfield methods
Replaced SecureString creation with existing code method.
Merge branch 'master' of https://github.com/OfficeDev/PnP.git
Consolidated CreateField method to have one base internal method.
Add function GetWeb(). Add function RemoveAppInstanceByTitle(). Some cleanup.
Move strings into resource file
Marked obsolete methods to not show in intellisense
Merge branch 'master' into dev

Conflicts:
	OfficeDevPnP.Core/OfficeDevPnP.Core/Version.txt
Updated the BindFieldsToTermSetsFromXMLFile and BindFieldsToTermSetsFromXMLString methods + did re-order methods + lots of comment updates
Renamed to follow server cmdlet naming