__getitem__ seperation

[henryiii]

Refactoring __getitem__ into a normal method that __getitem__ calls. Due to the odd tuple behavior of __getitem__, it is harder to use as an explicit method call than the other special methods. Was added in response to #296.

Should not affect any existing code, as it just adds an alternate way to call a command using method syntax.

[coveralls]

Coverage increased (+0.009%) to 80.484% when pulling 552ea69 on getitem into b461732 on master.

[coveralls]

Coverage increased (+0.009%) to 80.484% when pulling 552ea69 on getitem into b461732 on master.

[coveralls]

Coverage increased (+0.009%) to 80.484% when pulling 552ea69 on getitem into b461732 on master.

[coveralls]

Coverage increased (+0.003%) to 80.852% when pulling b432917 on getitem into 8333fc4 on master.