Added File > Import in which you choose a .contentproj file.
File and Build menu items now only appear as enabled when appropriate (eg, no save option if project is not dirty).
Project will now load even with broken references.
ContentItems with importers or processors which we fail to locate will now be shown as "missing".
Changing project references will now trigger content items to re-resolve their processor/importer type from the specified name.
Added documentation for classes in Microsoft.Xna.Framework.Audio
Resolve PSSTexture not disposing (Issue #2122)

Properly dispose of PSM's _textrue2D Fixes #2122
Correct issue where PSM SpriteEffect.cgx was named incorrectly
Create README.md

First pass at a documentation writing guide.
Update README.md

Spelling fixes.
Update README.md

Some formatting cleanup.
Update README.md

Small formatting changes.
Update README.md
Merge pull request #2455 from Alturos/develop

Resolve PSSTexture not disposing (Issue #2122)
Merge branch 'develop' into PipelineTool
Merge branch 'develop' into PipelineTool
Working on making PipelineProject.References editable.
Doc updates for Microsoft.Xna.Framework.Audio.
PipelineProject.References now editable in a separate dialog (rich text box). Properly notifies the controller when it is modified.
Added automatic remapping from old "MG.." style processor names to new names.
Importing of XNA projects should now be fully functional.
Update AudioCategory.cs
Update InstancePlayLimitException.cs
Update NoAudioHardwareException.cs
Fixed sizing of the textbox which appears for editing references.
Removed unnecessary INotifyPropertyChanged interface on PipelineProject.
References which contain "Microsoft" are completely ignored when importing a project.
Improved version control diff/merge for mgbc files by starting each content item with a comment line containing its sourcefile (and it already ends with a line containing its source file, the /build command).
Reference edit dialog now will appear with a minimum size (was collapsed on itself if there were no references).
Moved the reference edit classes to a code file under \Windows since it contains winforms specific code.
References containing "monogamecontentprocessors" are now ignored.
Handle texture filter type "None" to force no mipmaps.