Propertybag

[+] __contains__ operator
[+] __ne__ operator
[!] += and -= operators work correctly
[+] Find by type operator
[+] Allow initialization with multiple dict objects

[+] Added global variable __info__
[+] . and [] both return Bag() objects
[+] Bag() constructor accepts a json string

[+] Added exists()
[+] Added delete()

[+] Added bag() function

[!] get() function correctly handles numeric keys