git: MANIFEST, build, *.egg in gitignore

* Removes `MANIFEST` from gitignore.

* Adds `build` and `*.egg` to gitignore.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
setup: removal of `requirements.pip`

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
docs: removal of unnecessary `make.bat`

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
setup: initial release of `CHANGES`

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
setup: `run_tests.sh` -> `run-tests.sh`

* Renames `run_tests.sh` to `run-tests.sh` for the overall consistency
  with our other Python packages.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
setup: initial release of `MANIFEST.in`

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>