PackageCloud doesn't support Ubuntu Artful yet.

Follow up e3d97f6d

Closes #2805

Travis images are broken by design.

Ubuntu Trusty on Travis is buggy.

Fixes #2752

Ubuntu Trusty on Travis is buggy.

Fixes #2752

* Switch to PackPack for packages
* Use `packagecloud` deployment for packages instead of travis.sh script
* Use `script` deployment for sources instead of travis.sh script
* Package all branches, but upload only 1.6/1.7
* Move all Travis CI script into the single Makefile

Rumprun is a toolchain to build unikernels based on NetBSD/Rump kernel.
Compiled images can be booted on KVM/XEN and even on "bare metal".

Unfortunally, Tarantool unikernels are still not fully functional due to
bugs in libeio and LuaJIT. However, now we have a simple way to check
cross-compilation for BSD/Rumpkernel and to bake unikernels from the code:

    OS=rumprun DIST=hw packpack
    qemu-system-x86_64 -enable-kvm -kernel build/tarantool-1.7.3.265.img

Make Travis CI green again!

Rawhide and Sid are bleeding edge technlogies.

Blobs and minified JS are prohibited by distributions.
Fixes packages on Debian Sid.

See #1939

Test may fail on OS X due to NOFILE limit.

https://github.com/tarantool/build/issues/16

Move coverage scripts to tarantool/build

With recent osx toolchains gcc is an alias for clang.

tests updated for new test-run
sophia_join.test.py implemented in lua

* tarantool_ctl -> tarantool_ctl
* Add test-run on travis-ci (closes gh-221)
* Proper fiber name in the log

Needed for server/pg_type.h header