Removed fallback check on each defineSecureProp call

This check was originally added because IE8's implementation is broken.
However, we already perform a test in the `can_define_prop` configuration,
so this is not necessary (it seems to be a relic).
Various argument handling optimizations

Permits more aggressive v8 optimization.
Removed try/catch from Interface.extend

Permits more aggressive optimization.
Removed unnecessary try/catch from isInstanceOf

Was just being lazy.
Generic performance test output

Styled for display to user as the tests are running, but data are written to
perf.out for additional processing.

You can style the perf.out file cleanly using:
  $ column -ts\| perf.out
Can now build multiple performance logs

`make perf` will build, by default, perf.log, but you may also build perf.*;
for example:

  $ make perf.1
  # make some changes
  $ make perf.2

This allows comparing changes easily.
Began performance test case result HTML generation

This will eventually yield much more useful interactive output.