Add pkix and mail projects to gradle build

Author: Peter

build.gradle

@@ -11,7 +11,7 @@ subprojects {
     }
 
     dependencies {
-        testCompile 'junit:junit:4.11'
+        testCompile group: 'junit', name: 'junit', version: '4.+'
     }
 
     sourceCompatibility = 1.5

mail/build.gradle

@@ -0,0 +1,7 @@
+dependencies {
+    compile project(':core')
+    compile project(':pkix')
+    compile project(':prov')
+
+    compile group: 'javax.mail', name: 'mail', version: '1.4.+'
+}

pkix/build.gradle

@@ -0,0 +1,4 @@
+dependencies {
+    compile project(':core')
+    compile project(':prov')
+}

settings.gradle

@@ -1 +1,5 @@
-include "core", "prov", "pg"
+include "core"
+include "mail"
+include "pg"
+include "pkix"
+include "prov"