Added new benchmark data

Retained old data from Octave 3.6.4 since octave benchmarks don't run in 3.8.x
Partially update benchmarks notebook
Update benchmark HTML table
Add Makefile to simplify benchmark updating
Update Gadfly plot
Merge pull request #132 from JuliaLang/cjh/release-0.3-bench

WIP: Update microbenchmarks for 0.3 release