Fix Up Symbols in Folder Icons and Additional Folders

[dominicap]

folder-books - https://www.google.com/design/icons/#ic_book

folder-cloud - https://www.google.com/design/icons/#ic_cloud

folder-code - https://www.google.com/design/icons/#ic_code

folder-private - https://www.google.com/design/icons/#ic_lock

folder-publicshare - https://www.google.com/design/icons/#ic_group

folder-recent - https://www.google.com/design/icons/#ic_restore

folder-templates - https://materialdesignicons.com/icon/android-studio

folder-videos - https://www.google.com/design/icons/#ic_movie

network-server - https://materialdesignicons.com/icon/server-network

user-bookmarks - https://www.google.com/design/icons/#ic_bookmark

user-folder - https://www.google.com/design/icons/#ic_person

[danielhickman]

Updated MDI.com icons with permalinks.