Added s3 cli to go agent stemcell build
[#59695194]

Signed-off-by: Nick Wade <nwade@pivotallabs.com>
Added better error handling around blobstore feature
[#59695194]

Signed-off-by: Nick Wade <nwade@pivotallabs.com>
Added implementation for s3 blobstore
[#59695194]

Signed-off-by: Nick Wade <nwade@pivotallabs.com>
Added error wrapping across application

Signed-off-by: Nick Wade <nwade@pivotallabs.com>
Added vet and cover from the go.tools package
This is part of Go 1.2

Signed-off-by: Nick Wade <nwade@pivotallabs.com>
Added build for go agent tests on Travis CI

Signed-off-by: Damien Le Berrigaud <damien@pivotallabs.com>
Follow package naming conventions

Signed-off-by: Damien Le Berrigaud <damien@pivotallabs.com>