myria-python: update submodule with backend SSL support
myria-web: add SSL support

1) Move the URI schema (http or https) into the Python myriaConnection
   variable and update the web pages (html, js) accordingly.

2) Add a SSL argument and property to the app, by default FALSE for
   now. This is a prep for their being SSL support in MyriaX soon.
browser alert: make dismissible

See http://getbootstrap.com/components/#alerts-dismissible
html: move global JS vars to base.html

myriaConnection and connectionString are used in several places, so put
them in the base.
put up an alert if the backend is down
Merge pull request #187 from uwescience/better-down-message

Better down message
Merge pull request #189 from uwescience/myria-web-https

Myria web https
Merge branch 'master' into update-agg-format