Allow specifying rootUrl at runtime

[LegNeato]

This can be useful for testing (pointing clients at localhost) or proxying (if for some reason the proxy option is insufficient).

Note that I am still using buildurl, though I am only building url fragments. Perhaps it should be renamed to escapeurl, as it doesn't even really build a url...

I did not squash so you could see the template changes vs the generated api code changes. Let me know if you want me to do so.

• npm test succeeds
• Pull request has been squashed into 1 commit
• I did NOT manually make changes to anything in apis/
• Code coverage does not decrease (if any source code was changed)
• Appropriate JSDoc comments were updated in source code (if applicable)
• Approprate changes to readme/docs are included in PR

[codecov-io]

Codecov Report

Merging #756 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #756   +/-   ##
=======================================
  Coverage   79.49%   79.49%           
=======================================
  Files           5        5           
  Lines         239      239           
  Branches       53       53           
=======================================
  Hits          190      190           
  Misses         30       30           
  Partials       19       19

---

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[jmdobry]

LGTM, go ahead and remove everything from your PR except your changes to templates/method-partial.ts and the test file.

[googlebot]

So there's good news and bad news.

👍 The good news is that everyone that needs to sign a CLA (the pull request submitter and all commit authors) have done so. Everything is all good there.

😕 The bad news is that it appears that one or more commits were authored by someone other than the pull request submitter. We need to confirm that they're okay with their commits being contributed to this project. Please have them confirm that here in the pull request.

Note to project maintainer: This is a terminal state, meaning the cla/google commit status will not change from this state. It's up to you to confirm consent of the commit author(s) and merge this pull request when appropriate.

[LegNeato]

Ok, rebased on latest master and only did the commit with the test and template changes. 👍

Note that the tests will fail until APIs are regenerated...

[googlebot]

CLAs look good, thanks!

[jmdobry]

Looks good, thanks!