[SVN] initial commit after SVN rebirth;

[SVN] bump to version 2.0
[UPD] now transport working with telethon 0.15.5 and sleekxmpp 1.3.2
[FIX] fixed everlasting authorization requests. if you got deauth message — ignore it, FROM subscription is enough.
[ADD] implemented roster exchange via XEP-0144
[ADD] we will send authorization request when unknown contact sent us a message
[ADD] correct presence handling for transport and users
[ADD] fixed presence spam (by default, we updating presence once for 60 seconds -- look at `status_update_interval` in mtproto.py)
[ADD] we will automatically connect to all actual sessions after transport start

xmpp_tg/utils.py

@@ -0,0 +1,63 @@
+"""
+Различные полезные функции
+"""
+
+import types
+from datetime import datetime
+
+
+def display_tg_name(first_name, last_name):
+    if first_name and last_name:
+        return '{} {}'.format(first_name, last_name)
+    elif first_name:
+        return first_name
+    elif last_name:
+        return last_name
+    else:
+        return '[No name]'
+
+
+def make_gate_jid():
+    pass
+
+
+def parse_gate_jid():
+    pass
+
+
+def var_dump(obj, depth=7, l=""):
+    # fall back to repr
+    if depth < 0 or type(obj) is datetime:
+        return repr(obj)
+
+    # expand/recurse dict
+    if isinstance(obj, dict):
+        name = ""
+        objdict = obj
+    else:
+        # if basic type, or list thereof, just print
+        canprint = lambda o: isinstance(o, (int, float, str, bool, type(None), types.LambdaType))
+
+        try:
+            if canprint(obj) or sum(not canprint(o) for o in obj) == 0:
+                return repr(obj)
+        except TypeError:
+            pass
+
+        # try to iterate as if obj were a list
+        try:
+            return "[\n" + "\n".join(l + var_dump(k, depth=depth - 1, l=l + "    ") + "," for k in obj) + "\n" + l + "]"
+        except TypeError as e:
+            # else, expand/recurse object attribs
+            name = (hasattr(obj, '__class__') and obj.__class__.__name__ or type(obj).__name__)
+            objdict = {}
+
+            for a in dir(obj):
+                if a[:2] != "__" and (not hasattr(obj, a) or not hasattr(getattr(obj, a), '__call__')):
+                    try:
+                        objdict[a] = getattr(obj, a)
+                    except Exception as e:
+                        objdict[a] = str(e)
+
+    return name + "{\n" + "\n".join(l + repr(k) + ": " + var_dump(v, depth=depth - 1, l=l + "    ") + "," for k, v in
+                                    objdict.items()) + "\n" + l + "}"