Various cleanup

1. Updated CssLexer to use CharProducer properly and got rid of the
old lookahead and read() methods.
2. Fixed a few HtmlQuasiBuilder bugs around attributes, and
problematic tags like <option> and <td> which are ignored by
HTML5 rules unless they appear inside ceratin elements.
3. Upgraded to a moder version of servlet.jar to get rid of noisy
warnings from webdriver when running DomitaTest
4. Made CharProducer a CharSequence so that it can fit better with
the snippet producers.
5. Fixed Scope around "this" and "arguments"
6. Changed parse tree nodes for "finally", "catch", "try" blocks to
reflect the fact that they cannot be followed by a non-block
statement.
E.g. try foo(); catch (e) bar(); is syntactically invalid.
7. Added a renderBody method to function so that we can render
programs without an extra set of curly braces.
8. Removed unused imports from CompileHtmlStage and cleaned up
warnings in CajolingService
9. Moved optimization specific code from BuildServiceImplementation to
a new class JsOptimizer.
10. Changed RenderContext to allow better minified rendering of object
ctors.

Submitted @3832

[metaweta, 2009-11-02 20:17:08]

LGTM

http://codereview.appspot.com/146041/diff/1/4
File tests/com/google/caja/parser/html/HtmlQuasiBuilderTest.java (right):

http://codereview.appspot.com/146041/diff/1/4#newcode245
Line 245: public final void testProblematicElements() throws Exception {
good tests