reformat for whitespace
nullLit -> undefinedLit, since they're *very* different in terms of undefined variables
switch from nullLit to undefinedLit here as well
make %argPresent() return a native bool, and add support for them in generateCondBr.  generates tighter code dealing with parameter+default initialization
correct () nesting conversion error from the coffeescript.  fixes template-string2.js failure
bump escodegen
add test to catch typeof undefined/null regressions in the future