implement api for pegasus.conf

Should be able to programmatically create a pegasus.conf yml/json file.

Look at python config/ini files. (configparser package)

Note:
class Conf:
    def __init__(self):
        self.d = dict()

    def __setitem__(self, k, v):
        self.d[k] = v
    
    def __getitem__(self, k):
        return self.d[k]
    
    def __delitem__(self, k):
        del self.d[k]