Travis CI for Oil

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We use https://travis-ci.org/oilshell/oil to run automated builds and tests.

Build Configurations

TODO: Flesh this out more.

1. minimal dev build (build/dev.sh minimal) -- for people to quickly try Oil at HEAD. Requires few dependencies; no re2c or CommonMark; Nix could make this obsolete.
2. regular dev build (build/dev.sh all) -- what developers should run and modify to change Oil's behavior. Fast iteration
3. OVM tarball (arch independent). OVM is the fork of the CPython interpreter.
4. OVM binary -- building oil.ovm from the OVM tarball on Alpine, OS X, etc. -- arch-dependent.
5. oil-native tarball (arch independent). This isn't done on Travis and uses the mycpp tool.
6. oil-native binary -- building _bin/osh_eval.* and eventually oil from the oil-native tarball.

Platforms:

1. Ubuntu (GNU libc, GNU readline)
2. Alpine (musl libc)
3. OS X (may or may not use GNU readline)
4. nix on Linux
5. nix on OS X (sensitive to libc)