Pwntools-elf-only

- [1043][1043] Do not attempt to populate the libraries used by statically-linked binaries

[1043]: https://github.com/Gallopsled/pwntools/pull/1043

- [1038][1038] Fix an issue with `process()` where glibc would buffer data internally, causing a hang on `select()`
- [1036][1036] Fix Travis CI logging verbosity
- [1029][1029] Fix some `unicode` issues when using the `readline` command history in `tube.interactive()`

[1038]: https://github.com/Gallopsled/pwntools/pull/1038
[1036]: https://github.com/Gallopsled/pwntools/pull/1036
[1029]: https://github.com/Gallopsled/pwntools/pull/1029

- [1003][1003] Make `concat_all` faster while also simplifying it's logic
- [1014][1014] Fix for overwritten env when parsing core file
- [1023][1023] Fixes to Travis CI

[1003]: https://github.com/Gallopsled/pwntools/pull/1003
[1014]: https://github.com/Gallopsled/pwntools/pull/1014
[1023]: https://github.com/Gallopsled/pwntools/pull/1023