Rename readme, add -L flag for logs, PEP-8 fixes, if __main__ calls main_func()

Use /usr/bin/env python2 to find local python
Make __main__ call main_func() to accomodate setuptools entry_point console_scripts feature
Introduce -L <logfile> flag into b2bua_simple.py
Use as instead of comma in catch Exception, as per PEP-8
Use paranthesis for print() as per PEP-8
Update setup.py to use entry_point console_scripts, pull in github's default gitignore file for python projects.
Remove MANIFEST.in in favour of setup(packages = find_packages())