Fix installation with `pip` on a clean virtualenv.

Fix for https://github.com/ceelian/callme/issues/4
Missing file
Small logging cleanup

* Global logger is used
* Small syntax errors fixed
Tests refactored
Response exception handling simplified

Parameter 'exception_raised' removed from RpcResponse. The exception
response can be detected on run-time with 'is_exception' property, so
there is no need to set it explicitly.
Correct kombu version requirements
Small documentation fix
Added base exception for all callme exceptions
fixed comments and made them py3k ready
Merge branch 'tests-refactor' of https://github.com/skudriashev/callme into skudriashev-tests-refactor
merged
Merge pull request #15 from skudriashev/fix-setup-requirements

Correct kombu version requirements
Merge pull request #16 from skudriashev/documentation-fix

Small documentation fix
merged
Merge branch 'master' of github.com:ceelian/callme
merged PR 'Fix installation with
Usage:
  pip <command> [options]

Commands:
  install                     Install packages.
  uninstall                   Uninstall packages.
  freeze                      Output installed packages in requirements format.
  list                        List installed packages.
  show                        Show information about installed packages.
  search                      Search PyPI for packages.
  wheel                       Build wheels from your requirements.
  zip                         Zip individual packages.
  unzip                       Unzip individual packages.
  bundle                      Create pybundles.
  help                        Show help for commands.

General Options:
  -h, --help                  Show help.
  -v, --verbose               Give more output. Option is additive, and can be used up to 3 times.
  -V, --version               Show version and exit.
  -q, --quiet                 Give less output.
  --log <file>                Log file where a complete (maximum verbosity) record will be kept.
  --proxy <proxy>             Specify a proxy in the form [user:passwd@]proxy.server:port.
  --timeout <sec>             Set the socket timeout (default 15 seconds).
  --exists-action <action>    Default action when a path already exists: (s)witch, (i)gnore, (w)ipe, (b)ackup.
  --cert <path>               Path to alternate CA bundle. on a clean virtualenv.'
fixed bug introduced with previous merge
updated contributors and year
fixed readme typp