Update GetImageDetails.md

Added ImageSize.MimeType to results.
Adding page for GetCollections
Update GetCollections.md
Update GetCollections.md
Update GetCollections.md
Merge pull request #23 from MarkPit/master

Update GetImageDetails.md
Merge pull request #24 from nskirov/master

Added GetPreviousDownloads documentation
Update SearchForImages.md

Add Oldest sort type to the EditorialSortOrder
Update SearchForImages.md

change wording to reflect oldest sort type
Merge pull request #25 from Sarukod/master

Update EditorialSortOder
Update GetCollections.md
Merge remote-tracking branch 'upstream/master'
Update GetCollections.md
Update GetCollections.md
Fixing oauth link
Update GetCollections.md
Update GetCollections.md
Update SearchForImages.md

Updated EditorialSortOrder to note that "Oldest" is sorted by DateCreated rather than DateSubmitted.
Update SearchForImages.md

Make description of request field EditorialSegments more explicit.
Merge pull request #26 from paulkrugGetty/patch-1

Update SearchForImages.md