Log Message:
Update to 3.1:

* Noteworthy changes in release 3.1 (released 2012-11-24) [stable]
- Completed rename of types:
  ASN1_ARRAY_TYPE -> asn1_static_node (was asn1_static_node_t)
- Added new types: VisibleString, NumericString, IA5String, TeletexString,
  PrintableString, UniversalString, BMPString, UTF8String. When re-defined
  a warning is being print instead of failing.
- Parser outputs more detailed syntax error messages.
- Added asn1_decode_simple_der() and asn1_encode_simple_der().
- Added asn1_read_value_type() to return value and type.
- Introduced ASN1_ETYPE_UTC_TIME and ASN1_ETYPE_GENERALIZED_TIME

* Noteworthy changes in release 3.0 (2012-10-28) [stable]
- Added tool in tests/ to benchmark X.509 structure decoding.
- Added asn1_read_node_value() to obtain a node's value.
- Optimizations in internal tree allocation.
- Optimizations in tree search.
- libtasn1.h no longer exports internal structures.
- Types were renamed for consistency:
  ASN1_DATA_NODE -> asn1_data_node_st
  ASN1_ARRAY_TYPE -> asn1_static_node
  ASN1_TYPE -> asn1_node
  ASN1_TYPE_EMPTY -> NULL
  static_struct_asn -> asn1_static_node_st
  node_asn_struct -> asn1_node_st
  node_asn -> asn1_node_st
  (the old types are still available as definitions)