Merge branch 'release/0.0.17' into develop
Fixed YARD URL.
Added a License notice.
Aliased CExtensionTask -> RubyLibraryTask
Refactoring.
Add `cc=` option to each task.
Added Examples section to README.md
Added the `Alternatives` section.
Add YARD comments to ExecutableTask.
Add YARD comments to StaticLibraryTask.
Add YARD comments to SharedLibraryTask.
Add YARD comments to CExtensionTask.
Added "Feature Overview" section.
Deleted "Supported Platforms" section.
Fixed the link to CExtensionTask.
Updated gem dependencies.
Fix watched file list in Guardfile.
redcarpet 3.0.0 does not compile with Ruby 1.8.7.
Fix cc= option.
Run rake as sub-process in cucumber.