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Fix Arch Linux package name

Add command line option for bell notifications

'--alert/A'

Signed-off-by: Jun-Ru Chang <jrjang@gmail.com>

Fix Arch Linux package name

The name of the package was changed in AUR since 'telegram-git' is about vanilla telegram instead of this and causes ambiguity.

fix add_contact and rename_contact

Fix when crashing if print_name is null

Fix it to work on current stable gentoo.

Fixed random crashes and crash on group link request

- (Random crashes) Fixed uninitialized variable prompt_was; please, use static variables to make life easier to everyone.
- Removed duplicate line 2138. The print_start/print_end mechanism is weak, there's a lot of redundant code and bugs are hard to catch.

Unnecessary brew installs

do fflush instead of readline when readline is disabled.

Updates Fedora install guide

Replaces `yum` with `dnf`.

 - fixes issue when output is getting buffered and is not sent until message is received or program has stopped
 - I used this answer http://stackoverflow.com/a/1716621/74167 for solution

Brew can do it inline.

Enabled Peer.fwd_msg for python scripts

Use sizeof() to get size of sun_path.