Merge pull request #106 from derrh/master

Making section's courseID a string
Merge pull request #107 from derrh/master

convert courseID to string on CKISection
fixed some bugs with the course id data type
Merge pull request #108 from instructure/jsonapi-support

Jsonapi support
Adds support for fetching a poll by id.
Merge pull request #109 from derrh/jsonapi-support

Adds support for fetching a poll by id.
Merge pull request #110 from instructure/jsonapi-support

Fetching Poll by ID