Add bundler and guard support
Refactor spec code
Add concatenating and flattening to Enumerators
Fix gem related files
Rename concatenating to concating
Move combiners from Enumerator to Enumerable
Make flattening deep, like flatten
Add optional depth parameter to flattening
Merge pull request #1 from philou/master

Cancatenating and flattening for ruby 1.9 enumerators