add fastcomp stack overflow checks and testing
explicitly provide Module to EM_ASM scripts, so that they work even if Module was removed by closure; #2639
Update emscripten.h, html5.h docs to match the source files
Remove comments from preamble.js. Add link to doc file and built version
Remove comments from emscripten.h. Add link to doc file and built version
Remove comments from html5.h. Add link to doc file and built version
update local docs
Significant updates to the building emscripten from source topiss