Release 0.12.0

• Fix potential infinite loop in resolver (#200)
• Prevent potential memory leak in xmpp_stanza_new_from_string() (#205)
• Do proper SO versioning
• Add code coverage support (#188)
• Add support for password-protected TLS key & PKCS#12/PFX files (#195, #205)
• Stream-Management support - XEP-0198 (#184)
• New API:
  • xmpp_conn_send_queue_len()
  • xmpp_conn_send_queue_drop_element()
  • xmpp_conn_get_sm_state()
  • xmpp_conn_set_sm_state()
  • xmpp_free_sm_state()
  • xmpp_conn_get_keyfile()
  • xmpp_conn_set_password_callback()
  • xmpp_conn_set_password_retries()
  • xmpp_stanza_get_child_by_path()
  • xmpp_conn_set_sockopt_callback()
  • xmpp_sockopt_cb_keepalive()
• The following APIs were public in the shared library, but not in strophe.h.
  Now they are officially public API:
  • xmpp_rand_new()
  • xmpp_rand_free()
  • xmpp_rand()
  • xmpp_rand_bytes()
  • xmpp_rand_nonce()
  • xmpp_rand_bytes()
• The following APIs were public in the shared library, but not in strophe.h.
  In a future version of the library they will be private without replacement:
  • xmpp_alloc()
  • xmpp_realloc()
  • xmpp_strdup()
  • xmpp_strndup()
  • xmpp_strtok_r()
  • xmpp_snprintf()
  • xmpp_vsnprintf()
  • xmpp_log()
  • xmpp_error()
  • xmpp_warn()
  • xmpp_info()
  • xmpp_debug()
  • xmpp_debug_verbose()
• Deprecated the following API:
  • xmpp_conn_set_keepalive() - replaced by xmpp_conn_set_sockopt_callback()