MyMergerTree: use HTTPS instead of HTTP

Only merge/deploy this once MyriaX uses HTTPS
Merge remote-tracking branch 'upstream/master' into switch-to-https
SLL for MyMergerTree

Added a temporary hack to make this work, that is, adding the
rejectUnauthorized: false param to get requests (as described in this
SO question
https://stackoverflow.com/questions/20082893/unable-to-verify-leaf-signa
ture)
Merge pull request #11 from uwdb/pr/3

Pr/3