Merge pull request #4 from dnnsoftware/development

rollback https://github.com/dnnsoftware/Dnn.Platform/pull/162 as it is c...
DNN-5874 Check if unique display name is required when changing display name
[DNN-6037]

Updated HtmlTextController.cs, ManageRelativePaths() to skip tags with
"data:image" in the src property.  As the calling method
(FormatHtmlText) also hard codes the search for "src" and "background",
and the Data URI Scheme has been integrated in HTML since version 4.01,
it seems safe to allow the hard coding.  A potential improvement could
be to also allow "data:text/csv". This fix only applies to most non-IE
browsers.  IE doesn't send the base64 data when drag/drop is utilized,
so this fix also doesn't positively or negatively affect IE users.
Solution is simpler and cleaner than that suggested in DNN-6037.
DNN-6077 HtmlUtils methods should accept null strings

Added check for null or empty strings to all methods (except StripEntities, as it marked obsolete). If null or empty string is passed, modified methods return it unchanged.
Fixing faulty rendering of properties with spacial chars in it.
DNN-5254 Merge PR #209 into development
Merge pull request #179 from valadas/DNN-5874
Merge pull request #181 from 9Reg/development

[DNN-6037] Drag/Drop of Images in HTML Module from FireFox/Chrome/Opera
Merge pull request #193 from roman-yagodin/DNN-6077
DNN-6142 Content Localization does not work on Child sites
DNN-6150 - Installation fails in Windows Azure environment `Tables without a clustered index are not supported `
DNN-6151: added localization capability for 'Subscription Type' column values
DNN-5733 - On the one hand, being in VIEW mode, if versioning is enabled but the tab doesn't have  version history, then the tab was never modified under version control. So the modules in database is the right ones for the tab. On the other hand, being also in VIEW mode and versioning enabled, if there isn't a publish version, no modules are shown.
DNN-6150 - Installation fails in Windows Azure environment `Tables without a clustered index are not supported `
SOCIAL-3652: Group AS Visibility Settings not working - removed duplicates and fixed security set bugs.
DNN-6136 Improve Portal Settings API
DNN-6136 Improve Portal Settings API
DNN-6136 Improve Portal Settings API
DNN-6136 Improve Portal Settings API
DNN-6165: update the text.