routes/cfg: implement GET
libraries/singularity: addRepoPRJob() fx

Also added a test & cleaned up some code. "cleaned".
cfg route & actually filled in tests for singularity
libraries/singularity: actually detect duplicate jenkins configs
test/libraries/singularity: completely flush out test cases
.travis.yml: only specify minor version
Merge pull request #10 from behance/config-endpoint

[WIP] /config endpoint