missing support for multiple apis

[plexigras]

having the ApiClient helper use a static apiPath limits us to only one API.

the easiest solution is probably to remove the formatUrl function and instead require the use of the full address instead of just the path.

changes would have to be done in

• githubHottest(reduxSaga).js
• githubHottest(reduxThunk).js
• ApiClient.js
• config.js