Refactoring

## Refactoring

* Fixed hoe rake tasks that were broken due to the change from README.txt to README.md
* Made the bin/benchmark-ips executable run the example code in the README, which aids in general testing
* Added Travis CI support
* Switched over to Minitest
* Added additional ways to access the configuration options of `Benchmark.ips` besides simply `Benchmark.ips(time, warmup)`. Documented in README. Added tests.
* General refactoring / DRYing of the code

## Updated Namespacing

```
module Benchmark::IPS
class Benchmark::IPS::Job
class Benchmark::IPS::Job::Entry
class Benchmark::IPS::Report
class Benchmark::IPS::Report::Entry
module Benchmark::Compare
```

## Updated Class Hierarchy

* Pulled more responsibility into `IPS::Job`, split `IPS::Job` into it's own file
* Pulled `IPS::Report` into it's own file
* Renamed `IPS::Report` to `IPS::Report::Entry`, created `IPS::Report`
* Benchmark.ips now returns `IPS::Report`
  * **Breaks interface!!** Requires semantic version bump

## To Do

* Return Comparison data in an object that is more useful