Added NodeCount property to ITag/Tag and an optional flag to tag retrieval methods on TagsService, in order to retrieve the count for the tag as well as it's text
Removed parameter for requesting count for tags and made including the count the default behaviour
Added ignore attribute to NodeCount property on TagDto
Added unit test for tags NodeCount property
Merge pull request #439 from AndyButland/u4-5290

U4-5290 - allow for retrieval of a tag's count as well as it's text