Fixes to the downloads section and building from source. First draft of val.h. Partial first draft of bind.h
better warning when no java
save llvm debug info for source maps, even if js opts run
fix testcase 1 of #1714, proper handling of resumeException, and remove hack in __cxa_begin_catch
ensure emscripten heap is at least 64K
fix asm.js validation for coroutine
Merge pull request #2673 from coolwanglu/coroutine_asm_fix

fix asm.js validation for coroutine
Merge pull request #2671 from hamishwillee/incoming

Fixes to the downloads section and building from source.
fix coroutine asm coercion
make cDefine error at compile time on missing defines; fixes #2672
pid/gid mess improved
qwe