Add Tomopy to VisTrails

[celiafish]

• Added tomopy to auto-import list.
• Modified scraper to be able to handle return parameters without names.
• Fixed the output port bug when there is no return value.

[celiafish]

@sameera2004 rebased. Please check and merge. Thanks.

[sameera2004]

@celiafish This works fine, tomopy is working fine in VisTrials, Only this coverage issue?

[celiafish]

@tacaswell Any suggestion about this?

[danielballan]

Coverage issue is tiny (-0.02%). Looks good -- merging.