Set browser title with database and table titles.

Set browser title with database and table titles.

* src/main/java/org/glom/web/client/activity/TableSelectionActivity.java:
Set the browser title when the table changes and when the activity
first starts.
* src/main/java/org/glom/web/server/OnlineGlomServiceImpl.java: Set
title when retrieving document info (the GlomDocument object).
* src/main/java/org/glom/web/shared/GlomDocument.java: Add title field
with getter and setter methods. Remove unused convenience constructor.
Use default code formatting.