Bump version to 0.3.7

Changelog:

* add Coub support (thanks @davydovanton)
* refactor to use more idiomatic ruby (thanks @carlosplusplus)
Update gemspec to decrease deprecation warnings

* update description, summary to mention embed codes (close #16)
* switch from debugger to pry, because debugger sometimes causes build errors for me and pry is cool
* provide version numbers for development dependencies
Bump version to 0.3.8

Adjust gemspec
Delete excess dependency on httparty (fix #19)
Refactor move to net/http

Must specify whether to use https or http
Merge pull request #23 from maxjacobson/delete-httparty-gem

Remove httparty dependency
Bump version to 0.3.9

Changelog:

* Remove HTTParty dependency (thanks @davydovantov)