Add support for public keys encoded with PKCS#1

1) Add support for public keys encoded with PKCS#1
2) Add tests for PKCS#1 PEM and DER, and PKCS#8 DER
diff --git a/ChangeLog b/ChangeLog
index b3d4d51..f13982b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -4,6 +4,7 @@
 
 Features
    * Allow comments in test data files.
+   * Add support for public keys encoded in PKCS#1 format
 
 Bugfix
    * Fix memory leak in mbedtls_ssl_set_hostname() when called multiple times.