OmegaConf is changeing the pyyaml SafeLoader

[omry]

Context

Instead of changing the core one, it should return a new one to avoid changing the behavior of pyyaml.

In [2]: import yaml

In [3]: yaml.load("gitrev: 10e10", Loader=yaml.loader.SafeLoader)
Out[3]: {'gitrev': '10e10'}

In [4]: yaml.load("gitrev: 100e100", Loader=yaml.loader.SafeLoader)
Out[4]: {'gitrev': '100e100'}

In [5]: from omegaconf import OmegaConf

In [6]: yaml.load("gitrev: 100e100", Loader=yaml.loader.SafeLoader)
Out[6]: {'gitrev': '100e100'}

In [7]: OmegaConf.create("gitrev: 100e100")
Out[7]: {'gitrev': 1e+102}

In [8]: yaml.load("gitrev: 100e100", Loader=yaml.loader.SafeLoader)
Out[8]: {'gitrev': 1e+102}