Added 2 applications examples that use glcoud-node.

[sebelga]

• gstore-node : a entity modelling library
• gstore-api : a REST api builder for Express Router to manage Datastore Entities

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[sebelga]

I signed the CLA! :)

[googlebot]

CLAs look good, thanks!

[coveralls]

Coverage remained the same at 100.0% when pulling 7f94c44 on sebelga:master into d995fb6 on GoogleCloudPlatform:master.

[stephenplusplus]

Awesome, thanks :)