Update microbenchmarks for 0.3 release

This PR updates the microbenchmarks used for JuliaLang/julialang.github.com#132

- On newer systems, the NodeJS interpreter is now called `nodejs` instead of `node`
- The Java benchmarks did not run correctly due to incorrect reasoning about the `java` subdirectory
- Adds Java benchmarks to the HTML table generated
- Very minor formatting adjustments to the HTML table to better conform to the final published version