Adding a String constructor method for Client

Author: Kyle LeNeau

.gitignore

@@ -1,3 +1,5 @@
 /target
 **/*.rs.bk
-Cargo.lock
+Cargo.lock
+.idea
+.DS_Store

src/client.rs

@@ -4,7 +4,7 @@ use std::str::from_utf8;
 use futures::future::{self, Future};
 use futures::stream::Stream;
 use reqwest as r;
-use reqwest::r#async as ra;
+use reqwest::{r#async as ra, Url};
 
 /*
  * TODO remove debug output
@@ -136,6 +136,20 @@ impl Client {
         })
     }
 
+    /// Construct a new `Client` (via a [`ClientBuilder`]). This will not
+    /// perform any network activity until [`.stream()`] is called.
+    ///
+    /// [`ClientBuilder`]: struct.ClientBuilder.html
+    /// [`.stream()`]: #method.stream
+    pub fn for_str(str_url: &str) -> Result<ClientBuilder> {
+        let url = Url::parse(str_url)
+            .map_err(|e| Error::HttpRequest(Box::new(e)))?;
+        Ok(ClientBuilder {
+            url: url,
+            headers: r::header::HeaderMap::new(),
+        })
+    }
+
     /// Connect to the server and begin consuming the stream. Produces a
     /// [`Stream`] of [`Event`]s.
     ///