[gwt-contrib] Fix 'ant dist-dev' and 'ant-doc' builds: (issue953801)

[rice]

Reviewers: fabbott,

Description:
Fix 'ant dist-dev' and 'ant-doc' builds:
1) Add memory to java heap for 'gwt.javac'
2) Break up a line in JsonResults that caused javac to exit
3) Remove an annotation in SafeHtmlHostedModeUtils that caused javadoc
to crash
4) Update the list of packages for which we generate javadoc
5) Clean up cellview/client/package.html file
6) Add safehtml/{client,shared}/package.html files

Please review this at http://gwt-code-reviews.appspot.com/953801/show

Affected files:
  M common.ant.xml
  M doc/build.xml
  M doc/packages.properties
  M  
user/src/com/google/gwt/requestfactory/client/impl/messages/JsonResults.java
  A user/src/com/google/gwt/safehtml/client/package.html
  M user/src/com/google/gwt/safehtml/shared/SafeHtmlHostedModeUtils.java
  A user/src/com/google/gwt/safehtml/shared/package.html
  M user/src/com/google/gwt/user/cellview/client/package.html


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