Feat register project namespace

[irainia]

This PR addresses #204 .

Changes

Project

Two additional commands are introduced here:

• register project configuration and optionally along wit the namespaces

optimus project register [--flag]

• describe project configuration from the selected server

optimus project describe [--flag]

Namespace

Three additional commands are introduced here:

• register namespace configuration

optimus namespace register [--flag]

• describe namespace configuration from the server

optimus namespace describe [--flag]

• list namespaces from the server and the local config (if any)

optimus namespace list [--flag]

For this PR to be merged, this PR and this PR should be merged.

[coveralls]

Pull Request Test Coverage Report for Build 2152382195

• 54 of 55 (98.18%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.3%) to 75.047%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
config/config_client.go	35	36	97.22%

Totals
Change from base Build 2148543985:	0.3%
Covered Lines:	5991
Relevant Lines:	7983

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💛 - Coveralls