Adds attachments support: servlet and UI.

[veg...@gmail.com]

Reviewers: Soren Lassen, hearnden, Michael,

Description:
Adds attachments

Please review this at http://codereview.waveprotocol.org/616002

Affected files:
M .classpath
M build.xml
M src/org/waveprotocol/box/server/persistence/AttachmentStore.java
M
src/org/waveprotocol/box/server/persistence/file/FileAttachmentStore.java
M src/org/waveprotocol/box/server/persistence/mongodb/MongoDbStore.java
M src/org/waveprotocol/box/server/rpc/AttachmentServlet.java
M src/org/waveprotocol/box/webclient/client/HistorySupport.java
M src/org/waveprotocol/wave/client/StageThree.java
M src/org/waveprotocol/wave/client/StageTwo.java
M src/org/waveprotocol/wave/client/wavepanel/impl/toolbar/EditToolbar.css
M src/org/waveprotocol/wave/client/wavepanel/impl/toolbar/EditToolbar.java
M
src/org/waveprotocol/wave/client/wavepanel/impl/toolbar/EditorToolbarResources.java
M src/org/waveprotocol/wave/client/wavepanel/impl/toolbar/Toolbar.gwt.xml
A
src/org/waveprotocol/wave/client/wavepanel/impl/toolbar/attachment/AttachmentPopupWidget.css
A
src/org/waveprotocol/wave/client/wavepanel/impl/toolbar/attachment/AttachmentPopupWidget.java
A
src/org/waveprotocol/wave/client/wavepanel/impl/toolbar/attachment/AttachmentPopupWidget.ui.xml
A
src/org/waveprotocol/wave/client/wavepanel/impl/toolbar/images/edit/attachment.png
A src/org/waveprotocol/wave/client/wavepanel/view/AttachmentPopupView.java
M src/org/waveprotocol/wave/media/model/Attachment.gwt.xml
M
test/org/waveprotocol/box/server/persistence/AttachmentStoreTestBase.java
A third_party/runtime/commons-fileupload/LICENSE.txt
A third_party/runtime/commons-fileupload/README.google

[veg...@gmail.com]

The patch comes without binary files since rietveld doean't work well
with them. I sent emails to all initial code reviewers with the binary
files.

http://codereview.waveprotocol.org/616002