termshare 0.2.0 (new formula)

Quick and easy terminal sharing for getting quick help
or pair sysadmin'ing.

Share interactive control with a copilot and/or a readonly
view of your terminal with others. Copilots and viewers
can use the client or a web-based terminal.

https://termsha.re
Use version tarball and fix hg build dependency
Revert depends_on mercurial dependency

Going back to working version using `depends_on :hg` as used by the `nsq.rb` formula.
termshare: add 0.2.0 bottle.