add documentation.
remove unused import.
cleanup sources.
remove Functor restriction.
API documentation.

add & construct documentaion data type.
change File interface.
rename Documentation types, fix compile errors.
enhance extractRoute.
version bump up. fix persistent compile error.
fix compile error.
auto API documentation complete.
fix compile error on ghc-7.6.
update documentation.
add example url.
Merge branch 'develop'

auto generate API documentation.
remove Functor restriction.