Support for iterating across (-a) empty objects/arrays. Fixed issue with nested iterations.

[fschopp]

Changes:

• Added support for iterating across (-a) empty objects/arrays. Previously:

$ echo '[]' | jshon -a -t
parse error: bad json on arg 1, "-a"

Now produces no output, as expected.

• Fixed bug that would occur with nested iterations. Previously:

$ echo '{"a":[1,2],"b":["3","4"]}' | jshon -a -a -t
number
number
string
string
parse error: bad json on arg 1, "-a"

Now:

$ echo '{"a":[1,2],"b":["3","4"]}' | ./jshon -a -a -t
number
number
string
string