General code improvements

Signed-off-by: Lee Smet <lee.smet@hotmail.com>

src/models/flow.rs

@@ -42,7 +42,7 @@ impl Flow {
     pub fn context_id(&self) -> u32 {
         self.context_id
     }
-    pub fn jobs(&self) -> &Vec<u32> {
+    pub fn jobs(&self) -> &[u32] {
         &self.jobs
     }
 }

src/models/job.rs

@@ -47,10 +47,10 @@ impl Job {
     pub fn context_id(&self) -> u32 {
         self.context_id
     }
-    pub fn depends(&self) -> &Vec<u32> {
+    pub fn depends(&self) -> &[u32] {
         &self.depends
     }
-    pub fn prerequisites(&self) -> &Vec<String> {
+    pub fn prerequisites(&self) -> &[String] {
         &self.prerequisites
     }
     pub fn script_type(&self) -> ScriptType {