Add support for "FROM image as name" (#108)

Author: Miouge1

Diff for: config/default_rules.yaml

@@ -73,7 +73,7 @@
                - "_recommended_labels_for_your_project"
 
     FROM: 
-      paramSyntaxRegex: /^[\w./\-:]+(:[${}\w.]+)?(-[${}\w.]+)?$/
+      paramSyntaxRegex: /^[\w./\-:]+(:[${}\w.]+)?(-[${}\w.]+)?( as \w+)?$/i
       rules: 
         - 
           label: "is_latest_tag"

Diff for: sample_rules/basic_rules_atomic.yaml

@@ -73,7 +73,7 @@
                - "_recommended_labels_for_your_project"
 
     FROM: 
-      paramSyntaxRegex: /^[\w./\-:]+(:[\w.]+)?(-[\w]+)?$/
+      paramSyntaxRegex: /^[\w./\-:]+(:[\w.]+)?(-[\w]+)?( as \w+)?$/i
       rules: 
         - 
           label: "is_latest_tag"

Diff for: sample_rules/default_rules.yaml

@@ -73,7 +73,7 @@
                - "_recommended_labels_for_your_project"
 
     FROM: 
-      paramSyntaxRegex: /^[\w./\-:]+(:[${}\w.]+)?(-[${}\w.]+)?$/
+      paramSyntaxRegex: /^[\w./\-:]+(:[${}\w.]+)?(-[${}\w.]+)?( as \w+)?$/i
       rules: 
         - 
           label: "is_latest_tag"

Diff for: sample_rules/modules.yaml

@@ -78,7 +78,7 @@
                - "_recommended_labels_for_your_project"
 
     FROM: 
-      paramSyntaxRegex: /^[\w./-]+(:[\w.]+)?(-[\w.]+)?$/
+      paramSyntaxRegex: /^[\w./-]+(:[\w.]+)?(-[\w.]+)?( as \w+)?$/i
       rules: 
         - 
           # Matches 'FROM fedora:latest'

Diff for: sample_rules/openshift.yaml

@@ -73,7 +73,7 @@
                - "http://docs.openshift.org/latest/creating_images/metadata.html#"
                - "defining-image-metadata" 
     FROM: 
-      paramSyntaxRegex: /^[\w./\-:]+(:[\w.]+)?(-[\w]+)?$/
+      paramSyntaxRegex: /^[\w./\-:]+(:[\w.]+)?(-[\w]+)?( as \w+)?$/i
       rules: 
         - 
           label: "is_latest_tag"

Diff for: sample_rules/osbs.yaml

@@ -72,7 +72,7 @@
                - "http://docs.projectatomic.io/container-best-practices/#"
                - "_recommended_labels_for_your_project"
     FROM: 
-      paramSyntaxRegex: /^[\w./\-:]+(:[\w.]+)?(-[\w]+)?$/
+      paramSyntaxRegex: /^[\w./\-:]+(:[\w.]+)?(-[\w]+)?( as \w+)?$/i
       rules: 
         - 
           label: "is_latest_tag"