Updated sourceinfo

Added packagepathmap to the SourceInfo, this in turn allows the RevelCLI app command to pass the source paths directly to Revel directly
Added default to build to be "target" of the current folder
Renamed source processor

model/source_info.go

@@ -29,6 +29,8 @@ type SourceInfo struct {
 	controllerSpecs []*TypeInfo
 	// testSuites list the types that constitute the set of application tests.
 	testSuites []*TypeInfo
+	// packageMap a map of import to system directory (if available)
+	PackageMap map[string]string
 }
 
 // TypesThatEmbed returns all types that (directly or indirectly) embed the