Add a development mode for contributions in "flogo ensure"#3

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debovema wants to merge 3 commits intosquare-it:ensure-development-modefrom

debovema:ensure-development-mode

Commits on Oct 5, 2018

Create symbolic links from vendor to pkg for explicit constraints in Gopkg.toml
debovema
committed
Add several flags options to flogo install command
debovema
committed

Commits on Oct 15, 2018

Checkout right branch when using development mode
debovema
committed