Revert "Upgrade Rhino to 1.7.12, SnakeYAML to 1.26 (#691)"

Breaks the tests.
This reverts commit 2f3dd8c

Author: jpbelang

pom.xml

@@ -32,7 +32,7 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <snakeyaml.version>1.26</snakeyaml.version>
+        <snakeyaml.version>1.23</snakeyaml.version>
         <slf4j.version>1.7.14</slf4j.version>
     </properties>
 

raml-parser-2/pom.xml

@@ -59,23 +59,14 @@
         <dependency>
             <groupId>com.github.java-json-tools</groupId>
             <artifactId>json-schema-validator</artifactId>
-            <version>2.2.13</version>
+            <version>2.2.10</version>
             <exclusions>
                 <exclusion>
                     <groupId>javax.mail</groupId>
                     <artifactId>mailapi</artifactId>
                 </exclusion>
-                <exclusion>
-                    <groupId>org.mozilla</groupId>
-                    <artifactId>rhino</artifactId>
-                </exclusion>
             </exclusions>
         </dependency>
-        <dependency>
-            <groupId>org.mozilla</groupId>
-            <artifactId>rhino</artifactId>
-            <version>1.7.12</version>
-        </dependency>
         <dependency>
             <groupId>com.googlecode.juniversalchardet</groupId>
             <artifactId>juniversalchardet</artifactId>