WIP: add encrypt and decrypt operations

Currently the encrypt operation works only to my public key and not to
keys generated by the generate key pair operation. Probably something
wrong with the generate operation.

.babelrc

@@ -1,4 +1,10 @@
 {
+    "plugins": [
+        ["transform-runtime", {
+            "polyfill": false,
+            "regenerator": true
+        }]
+    ],
     "presets": [
         ["env", {
             "targets": {