Properly return None.
Merge remote-tracking branch 'rixner/master'
Added test for min function
Convert python booleans to javascript booleans.
Force a more recent version of GitPython to be used
Merge pull request #170 from Lalaland/master

Fix min for custom classes
Merge pull request #167 from albertjan/repl-comments-improments

Repl comments improments
Move the ideas list onto the read me.
add string constants
implement capwords
add string.printable
begin implementing operator module
implement operator.concat
implement sequenceSetItem and sequenceGetItem
implement sequenceGetCountOf and sequence operator methods
refactor new abstract sequence methods to be more like the existing ones (and remove the need for a string switch)
implement the abstract method sequenceGetIndexOf; implement operator.indexOf
implement abstract sequenceConcat
implement operator.neg
implement operator.pos; implement operator.xor; implement operator.rshift