Fix various links such as Travis CI build badge and cargo repository
link.
The use of try! macro is deprecated in favor of ?. Occurences were
replaced.
The functions default_scale() and default_one() were never used, they were
deleted.
Use of Error::description is deprecated in favor of Display or
to_string. Implementation of Error::description was deleted, as
impl Display for UrdfError already existed.
Used std::fs::read_to_string instead of custom implementation
try!
macro is deprecated in favor of?
. Occurences were replaced.default_scale()
anddefault_one()
were never used, they were deleted.Error::description
is deprecated in favor ofDisplay
orto_string
. Implementation ofError::description
was deleted, asimpl Display for UrdfError
already existed.std::fs::read_to_string
instead of custom implementation