zdeskR 0.4.2.9000

zdeskR 0.4.2

Fixed examples in get_tickets() and get_users to reflect changes made previously in the function parameters for incremental querying. Addresses issue #8 brought up by @k-dutra.

This is a maintenance release that updates get_all_ticket_metrics(). Zendesk instructed developers to switch from offset-based pagination to cursor-based pagination. This is the only function that uses OBP. The other functions either do not use pagination, or, use time-based pagination.

added get_tickets_comments() to fetch the comments in a conversation on a ticket (#5, thanks to @k-dutra for making the request and creating the PR).

get_users() changed to use Zendesk's incremental export endpoint. Instead of pagination with the page= parameter there is now a start_time parameter. This is a breaking change-- previous function calls with the page # will not work, and the start_time value must be given.
get_users() now has a parameter for the user role. This is used to filter the api results before returning a data frame.
get_tickets() was updated to use better logic for the stopping value for pagination.
get_tickets() could have an error when combining custom field values of different types. These are now converted into a character column first before purrr::map_dfr() attempts to bind_rows().

styler used to clean up formatting.
remove_cols parameter added to get_tickets so that custom fields causing errors can be removed. Errors occurred when a field was sometimes blank and assigned a logical type were appended to non-blank, non-logical inside of a purrr::map_dfr. See issue #1 on GH opened by @nschaefer1211.

Added start_date parameter to the get_users function to enable pulling just more recent users rather than all users.
Changed get_tickets from using cursor pagination to start/end time pagination.
Pagination change allowed for the introduction of end_time as a parameter for the tickets call.

Added 2 more functions get_custom_fields() and get_users() to the package.
get_custom_fields() will allow us to fetch the system and all the custom fields defined by the zendesk administrator for an organization.
get_users() will allow us to fetch details of all the user registered in your zendesk organization.

Created initial set of functions to allow to authenticate and fetch tickets and tickets metrics data.
Tested and released to GitHub.