Version 0.4.0

2016-07-21 - v0.4.0

• Path operations now accept anything that implements AsRef<ffi::OsStr>, which enables support for path::Paths in addition to strs.
• Breaking change: Image media types are now represented by an enum instead of magic strings. It is easy to convert between the two forms using ::from().
• Breaking change: get/set_tag_long() are renamed get/set_tag_numeric().
• Breaking change: get/set_exif_tag_rational() renamed get/set_tag_rational().
• Breaking change: get/set_tag_long() now operate on i32 values, not i64.
• Breaking change: Errors are now wrapped in a new rexiv2::Rexiv2Error type.
• Breaking change: Results are now using a library-specific alias that fixes all Err() instances as Rexiv2Error.