better handling for application statistics

[shao1555]

in current version, application statistics always returns as zipped CSV file.
so I've make some modification to this library.

• retrieve CSV file, extract it (if need), then returns merged "ApplicationStatistics" model.
• add find / select features for collections of ApplicationStatistics
• write configuration in any context (like aws/aws-sdk-ruby)
• to reliable spec test, use WebMock instead of your custom mock class.

sorry for my poor code and english.

[shao1555]

no one is assigned?

[tmurakam]

Thanks. Your pull request was merged to features/application-statistics-model branch.
(Not yet merged to develop / master branch).

Whould you like to update ChangeLog file?

[shao1555]

thank you for your reviewing.

I've added ChangeLog file. but I don't know rules for version number in this project, so place version number to "x.x.x" .
please update version number in ChangeLog and change gemspec file after merge this.

[shao1555]

please merge it or give me some suggestion.

[tmurakam]

Merged to features/application-statistics-model branch.

[tmurakam]

I inspected your code, and found some issues.

1. Your code does not work for HTTP proxy environments.
   You must set configuration BEFORE call Scraper.new, because proxy configuration is read only when constructor of Scraper is called.

2. You changed config and agent to singleton, but I think this is not necessary change and I dislike this.