Fixing performance test - array `isset` wasn't hitting `null`
Fixing various examples considering `null` values in the map
Workaround for polyfractal/athletic#13 - setUp not being called per method run
Removing workaround for polyfractal/athletic#13, since it's fixed in `0.1.7`
Adding example performance test results
Fixing alignment of the Markdown table with performance results
Merge pull request #2 from Ocramius/hotfix/falsey-array-performance-fix

Falsey array performance tests fix