Add quarantine vtable for OSX

The tables reports:
- path: The file in quarantine
- creator: The application that created the file

Example:
osquery> select * from quarantine limit 10;

+----------------------------------------------------------------------------+---------------+
| path                                                                       | creator       |
+----------------------------------------------------------------------------+---------------+
| /Applications/Adium.app                                                    | Google Chrome |
| /Applications/Adium.app/Contents                                           | Google Chrome |
| /Applications/Adium.app/Contents/_CodeSignature                            | Google Chrome |
| /Applications/Adium.app/Contents/_CodeSignature/CodeResources              | Google Chrome |
| /Applications/Adium.app/Contents/Frameworks                                | Google Chrome |
| /Applications/Adium.app/Contents/Frameworks/Adium.framework                | Google Chrome |
| /Applications/Adium.app/Contents/Frameworks/Adium.framework/Adium          | Google Chrome |
| /Applications/Adium.app/Contents/Frameworks/Adium.framework/Headers        | Google Chrome |
| /Applications/Adium.app/Contents/Frameworks/Adium.framework/PrivateHeaders | Google Chrome |
| /Applications/Adium.app/Contents/Frameworks/Adium.framework/Resources      | Google Chrome |
+----------------------------------------------------------------------------+---------------+

Fixes issue #231
Feedback fixes to clean the code a bit
Some minor stetic changes to keep the code clean
Merge pull request #310 from facebook/quarantine

Add quarantine vtable for OSX