Replaced Iterable<> return type with List<> in public API to avoid deserialization errors.
Removed Java7 from  cdec13c94dd9cbe48ebb4dac985799da15b8feea

Fixed a small mistake related with Java7 using with Java6 build target.
Merge pull request #1 from adriannieto/master

Removed Java7 from  cdec13c94dd9cbe48ebb4dac985799da15b8feea
This closes #18