GPA Improvements: 1.15 to 2.02

[DannyBen]

An assortment of small to medium changes to improve code standards:

1. Exclude okjson from Code Climate
2. Remove / rename unused variables, mostly in the OptionsParser blocks
3. Add configfile method to CliHelpers to avoid repeating the confusing condition+assignment if configfile = find_configfile
4. Reduce code duplication in http_client by adding an attempt times, wait, &block method to handle HTTP retries in a single place.

CC: #78

[lmarburger]

Looks great!

[DannyBen]

Agree with everything, had the same thoughts on all subjects. The global rescue in the attempt method is a mistake on my part. Will update later today.

[lmarburger]

I'll give this a run through next week before merging and cutting a release.