Tglogger

Added
- `meta-*.zip` file to log message.

Changed
- Now stacktrace file is sent inside *meta* zip file that is attached to main
log message.

Removed
- Feature of sending stacktrace file as a separate message.

Added
- `TelegramHandler` now validates bot on initialization

Added
- Added `uuid` to `TelegramFormatter` and `request`
- Added `uuid` via `setLogRecordFactory`

Added
- Now if any exception occurs, it can be sent with stack trace as a file to
a chat.

Changed
- Now tglogger checks `DJANGO_SETTINGS_MODULE` environment variable instead of
the presence of `django`.

Changed
- Refactored `tglogger.request` module to use simple function called `send_log`

Added
- Explicit Django support

Changed
- Optimized Django parts