Adding Redbiom to master

[antgonza]

This is the PR agains master to add redbiom, below the ToDo list for completeness.

• Move out database code from qiita_pet.handler
• Decide what to do with the context limitation to search based on sequences. Let's discuss this on our next Qiita meeting. R: We will search over all the contexts. Solved Let's get redbiom-ing #2118
• Decide what to do with displaying on which categories/artifacts the search query is found. Also, let's discuss on next Qiita meeting. R: group by artifact processing, fix in Redbiom improving listing #2132
• Fix GUI based on decisions on the last points. R: fix in Redbiom improving listing #2132
• Fix the instuctions
• request by: @adswafford: user searches for category pH, then the "values" column next to it expands to show the number of samples and values, e.g. 6.0 10, 6.5 23 ...
• request by: @josenavas: figure out why a number is not a stem - redbiom, this should be addressed in the instructions
• request by @antgonza: when searching by observation we are not 100% sure if that observation is in the bioms displayed, need to talk to @wasade
• Others??

[coveralls]

Coverage decreased (-0.03%) to 91.949% when pulling 5dc2b40 on redbiom into 659cb94 on master.

[antgonza]

@wasade, @josenavas wrong PR, sorry, will add you to the other one.

[antgonza]

Closing in favor of: #2282