link: publish link as a module instead of re-exporting types

Author: pietroalbini

src/common/link.rs

@@ -1,3 +1,5 @@
+//! Link header and types.
+
 use std::fmt;
 use std::borrow::Cow;
 use std::str::FromStr;
@@ -58,7 +60,7 @@ use {Header, Raw};
 /// # Examples
 ///
 /// ```
-/// use headers::{Headers, Link, LinkValue, RelationType};
+/// use headers::{Headers, link::{Link, LinkValue, RelationType}};
 ///
 /// let link_value = LinkValue::new("http://example.com/TheBook/chapter2")
 ///     .push_rel(RelationType::Previous)

src/common/mod.rs

@@ -45,7 +45,6 @@ pub use self::if_range::IfRange;
 pub use self::if_unmodified_since::IfUnmodifiedSince;
 //pub use self::last_event_id::LastEventId;
 pub use self::last_modified::LastModified;
-pub use self::link::{Link, LinkValue, RelationType, MediaDesc};
 pub use self::location::Location;
 pub use self::origin::Origin;
 pub use self::pragma::Pragma;
@@ -165,7 +164,7 @@ mod if_range;
 mod if_unmodified_since;
 //mod last_event_id;
 mod last_modified;
-mod link;
+pub mod link;
 mod location;
 mod origin;
 mod pragma;