Update MediaService.md, adding an example of CreateMedia/Save

Added an example of the use of CreateMedia/Save.
Update MediaService.md

Modified example for MediaService/CreateMedia, and used Jeavon's version.
Update MediaService.md
Multilanguage setup tips

Added some tips about using dictionary items for translating document
type labels.
Updated information about document name

Updated the information so it also mentions that names of documents can
be translated using dictionary items.
Added a gotcha as detailed in U4-2227 (http://issues.umbraco.org/issue/U4-2227)
Merge branch 'master' of https://github.com/dampee/Umbraco4Docs
Merge branch 'master' of https://github.com/umbraco/Umbraco4Docs
Wiki documents about membership provider
doc about user object
import user documents from wiki
Initial documentation on tinyMceConfig command nodes
Added plugin and validElements draft
Fleshed out Plugins section with example of default config for v6,s ame for validElements node
Updates invalidElements and customConfig sections
Merge branch 'master' into TinyMceConfig
Razor samples for v7 MNTP Picker
fixed some links in the Reference/Api/Base/ folder.  File name cases were off.
linked to rest config file docs on our.umbraco.org for now, couldn't find it in the repo
added wiki content from http://our.umbraco.org/wiki/reference/umbraco-base/simple-base-samples/the-restextensionsconfig-file to Documentation/Using-Umbraco/Config-files/BaseRestExtensions/index.md
fixed the link for restExtentions.config in Documentation/Reference/Api/Base/Index.md