Added lists support

[dezconnect]

Add support of lists such as:

[section]
keyword[]=value1
keyword[]=value2
keyword[]=value3
keyword[]=value4

[jonase]

Could you update the example in the README as well?

[dezconnect]

Sure

[dezconnect]

Completed

[jonase]

@dezconnect

I ran a few tests and it seems like a file with a "top level" array doesn't work properly:

users[]=nike
users[]=joe

evaluates to

{"users[]" "joe"}

I also think that we should create a vector instead of a list, and not "reversed" as it is now.