Workflows install fails if fission is not installed in the "fission" namespace

[soamvasani]

[erwinvaneyk]

Proposed solution: change helm chart to assume by default that fission is located in the same as where fission workflows will be installed. To have workflows live in a seperated ns, the user will need to update the helm value to point to the ns with fission deployment it wants to use.

[soamvasani]

Yeah, ok, let's do that. It's not ideal, since the user controls installation namespaces, but I can't think of anything better.

[erwinvaneyk]

Fixed in #90 (which depends on fission/fission#413 in Fission)