Make internal proj constructors private
Remove unnecessary linting of generated exports file
No reason for build.py to run generate-exports.js

The doc task does not use the generated exports.js file.
Unused JAR executable
Unused JAVA executable
Merge pull request #2342 from tschaub/private-proj

Make internal proj constructors private.
Merge pull request #2343 from tschaub/build-cleanups

Build cleanups.
Change docs landing page to link to transformExtent
Document map DOM elements
Merge pull request #2355 from probins/mapelements

Document map DOM elements
Merge pull request #2358 from probins/patch-1

Change docs landing page to link to transformExtent