Implement "Search for config file from specific to general"

General MR

Summary

Implements the changes proposed in #200 (closed)

Relevant logs/screenshots

Using the arrangement of config files described in #200 (closed), example output from running bbctl config big-bang-repo in different directories:

BPH-MAC16% pwd
/Users/wesleygriffing/dev/bigbang/umbrella/development

BPH-MAC16% bbctl config big-bang-repo
~/dev/bigbang/umbrella/development

BPH-MAC16% cd ../master

BPH-MAC16% pwd
/Users/wesleygriffing/dev/bigbang/umbrella/master

BPH-MAC16% bbctl config big-bang-repo
~/dev/bigbang/umbrella/master

Linked Issue

#200 (closed)

Upgrade Notices

N/A

Closes #200 (closed)