Merge cocaine-tools "makefile" into setup.py

For ease of installation of framework and tools via setup.py install
add install action for scripts/cocaine-tool.

Use setuptools now instead of distutils for correct installation
dependency tracking (only opster now).

Divide dependencies for tools and framework (only opster now), so
use:
    python setup.py install --without-tools
for only framework installation (without cocaine-tools)