Patch 2: some fixes to the developer-docs stylesheet....

Patch 3: add "Since:" to the api level info
Patch 4: fix packages page and styles to reveal class summary

Squashed commit of the following:

commit 8fcdcb8dcbe9b93688f5eb1020654848d3242675
Author: Scott Main <smain@google.com>
Date:   Mon Jul 27 09:33:45 2009 -0700

    remove the toggle selector from the header.
    this will be added in a later change with the rest of the toggle script

commit 2423b30ee46c12f92051c4f2a096532e55752c46
Author: Scott Main <smain@google.com>
Date:   Fri Jul 24 16:29:21 2009 -0700

    Implement API Level styles.
    This changes the way we show the API Level for a given package/class/member.
    It also provides hooks in the document to allow us to restyle items
    based on a user-selected API Level (show/hide available items).
    More changes to provide the toggling feature will come soon.

commit efd94b33071070f0dfc2045131b81cbdfe078468
Author: Scott Main <smain@google.com>
Date:   Mon Jul 27 09:33:45 2009 -0700

    remove the toggle selector from the header.
    this will be added in a later change with the rest of the toggle script

commit 3fb79313232c993f700ee90a94f59dcca275fb0b
Author: Scott Main <smain@google.com>
Date:   Fri Jul 24 16:29:21 2009 -0700

    Implement API Level styles.
    This changes the way we show the API Level for a given package/class/member.
    It also provides hooks in the document to allow us to restyle items
    based on a user-selected API Level (show/hide available items).
    More changes to provide the toggling feature will come soon.