add metadata to "Get Phylogenetic Trees from Open Tree of Life"

[arlin]

For web service 5, add metadata to the information returned by service. The metadata should include

• the number of tips
• the version of the synth tree (synth_id in tree_of_life/about)
• the list of supporting studies (see below)
• the date and time of execution (see below)
• the URL of this service
• the URL for the docs for this service

@abusalehmdtayeen is already including a timestamp as a comment with the form // 20161221142133. This needs to be turned into a valid JSON expression.

The list of supporting studies is already included in the JSON returned by the OpenTree service.

[abusalehmdtayeen]

Done.

[arlin]

I'm sorry for taking so long to get to this. I see two small issues. One of them is that there is a missing space after induced_subtree in "inference_method": "induced_subtreefrom synthetic tree version opentree8.0".

Second, I think we should call the synth tree version "synth_id" rather than "synth_tree_version", on the grounds that this is what OpenTree uses. I have requested clarification from OT about whether they intend to anchor all their terms in a formal vocabulary.

[abusalehmdtayeen]

Corrected the issues.