per project aws config and named aws profile

[UnleashedMind]

This pull request contains these major changes:

1. Configuration on aws access is now per project, this enables use of different user credentials to access different mobile hub project associated with different frontend projects. This change allows more flexibility in using the cli.
2. Added the use of named aws profiles through awsmobile configure aws --profile <name>
3. awsmobile push timestamp check is refactored to be more accurate, to avoid unneccessary update on the backend awsmobile project in the aws cloud.

[codecov-io]

Codecov Report

Merging #49 into master will decrease coverage by 0.37%. The diff coverage is 21.1%.

@@            Coverage Diff             @@
##           master      #49      +/-   ##
==========================================
- Coverage    50.3%   49.92%   -0.38%     
==========================================
  Files          46       52       +6     
  Lines        2944     3387     +443     
  Branches      460      543      +83     
==========================================
+ Hits         1481     1691     +210     
- Misses       1200     1373     +173     
- Partials      263      323      +60

Impacted Files	Coverage Δ
lib/utils/awsmobilejs-constant.js	100% <ø> (ø)	:arrow_up:
lib/utils/cli-config-manager.js	25% <ø> (ø)	:arrow_up:
lib/backend-operations/ops-user-signin.js	20.68% <0%> (ø)	:arrow_up:
lib/backend-operations/ops-project.js	32.35% <0%> (ø)	:arrow_up:
lib/backend-operations/ops-hosting.js	23.91% <0%> (ø)	:arrow_up:
lib/aws-operations/aws-client.js	15.38% <0%> (+0.23%)	:arrow_up:
lib/backend-operations/cloud-api-lambda-builder.js	7.85% <0%> (-0.42%)	:arrow_down:
...ib/backend-operations/cloud-api-lambda-uploader.js	11.86% <0%> (+0.19%)	:arrow_up:
lib/aws-operations/mobile-exportjs-file-manager.js	18.3% <0%> (ø)	:arrow_up:
lib/utils/awsmobilejs-name-manager.js	28.57% <0%> (-4.77%)	:arrow_down:
... and 24 more

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