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
Merge branch 'master' into delete-httparty-gem

Conflicts:
	film_snob.gemspec