js: add verify and signature parsing

--

* src/gpgmejs.js:
  - Added verify method
  - Added verification results in decrypt (if signatures are present
    in the message)
  - Added a base64 option to decrypt

* src/Signature.js: Convenience class for verification results. Used
   for e.g. converting timestamps to javascript time, quick overall
   validity checks

* src/Keyring.js: removed debug code

* src/Errors.js add two new Signature errors

1 files changed, 8 insertions, 0 deletions

diff --git a/lang/js/src/Errors.js b/lang/js/src/Errors.js
index 73e74382..a8cd8b56 100644
--- a/lang/js/src/Errors.js
+++ b/lang/js/src/Errors.js
@@ -83,6 +83,14 @@ const err_list = {
             'configuration',
         type: 'error'
     },
+    'SIG_WRONG': {
+        msg:'A malformed signature was created',
+        type: 'error'
+    },
+    'SIG_NO_SIGS': {
+        msg:'There were no signatures found',
+        type: 'error'
+    },
     // generic
     'PARAM_WRONG':{
         msg: 'Invalid parameter was found',