clang 3.4.2 complains about weak_alias for a symbol that isn't defined
Improve dependencies.
Let -s RELOOPER work correctly.
Add vim temp files to .gitignore
Fix typo in AUTHORS.
remove some TODOs and commented-out test code
emit returncode in shell; fixes #1371
Merge pull request #2502 from waywardmonkeys/fix-AUTHORS-typo

Fix typo in AUTHORS.
Merge pull request #2503 from waywardmonkeys/remove-commented-out-and-todos

remove some TODOs and commented-out test code
Merge pull request #2501 from waywardmonkeys/update-gitignore

Add vim temp files to .gitignore
Merge pull request #2496 from waywardmonkeys/fix-relooper-setting

Let -s RELOOPER work correctly.
Merge pull request #2495 from waywardmonkeys/improve-scons-dependencies

Improve dependencies.
Merge pull request #2494 from waywardmonkeys/fix-musl-build-with-newer-clang

clang 3.4.2 complains about weak_alias for a symbol that isn't defined