Updating group_name regex to handle '.' character in group name along with '_' too.
Completing test: test_group_name_parse. Include testing for security group with '.' character in name. Tests are passing.
Starting adding icmp support
Updating docs with ICMP examples and link to icmp type numbers
Adding test for icmp protocol
Handling ICMP type 0
Adding sample ICMP rules
Adding information about ICMP protocol addition
Adding test for single ICMP rule
Adding a test to for tcp port 0 rule