Add client-go project.

This can be made into a very generic library thanks to runtime JSON
unmarshalling, see `GenomicsApi.invoke`.

`GenomicsApi.ReadsSearch` is one `invoke`r.
Merge pull request #22 from namn/add-client-go

Add client-go project.
Add admin login restriction to the mapreduce urls
Remove dead code
Delete unused file
Remove mockcoverage and sampledata

Users now have to run a map reduce pipeline over real data