Merge pull request swiftlang#37 from johnno1962/master

Minor typo fix

Author: mxcl

Sources/dep/Error.swift

@@ -30,7 +30,7 @@ extension Error: CustomStringConvertible {
         case ManifestTargetNotFound(let target):
             return "The manifest describes a target that cannot be found in your source tree: \(target)"
         case InvalidDependencyGraph(let package):
-            return "The dependency graph could not be satisifed (\(package))"
+            return "The dependency graph could not be satisfied (\(package))"
         case InvalidSourcesLayout(let sources):
             return "Your source structure is not supported due to conflicting directories: \(sources)"
         case UpdateRequired(let package):
@@ -39,4 +39,4 @@ extension Error: CustomStringConvertible {
             return "Failed to clone \(url) to \(dstdir)"
         }
     }
-}
+}