Added UpdateFieldDisplayName method

Added UpdateFieldDisplayName method to FieldAndContentTypeExtensions.cs.
Updated Provisioning.Jsom documentation

Removed original .docx and readme.txt, replaced with readme.md
Refactored AddDefaultColumnValues to SetDefaultColumnValues
Updated tests for SetDefaultColumnValues
Added HttpVariablesExtensions Tests
Added DateTimeExtension Tests
Moved UrlUtilityTests to correct project folder
Fixed NormalizePageName to return a filtered name instead of string.empty
Added StringExtensions Tests
Added JsonUtility Tests
Merge remote-tracking branch 'contributor/samples' into dev
update after merging PR 152. Removed method UpdateFieldDisplayName
Merge pull request #151 from erwinvanhunen/TestAdditions

Additional Tests
Merge remote-tracking branch 'contributor/defaultcolumnvaluesfix' into dev
Added globalization and MUI deck
Fixed project file to include correct references
Merge pull request #155 from erwinvanhunen/TestAdditions2

Fixed project file to include correct references