XEP-0199: XMPP Ping

Use modified StropheJS ping plugin (AMD support)
Add Ping functionality
Add Pong handler

Fix to issue #144:

Offline Pretty Status

add offline as possible case to enable translation

CSS: Fonts Path: editable $font-path via sass/variables.scss

Add a variable to build CSS with another path for the fonts
import added in  ``sass/converse.scss`` : Undefined variable $font-path
with ``make css``

Call to registerRosterXHandler and registerPresenceHandler on onReconnected give exception.

Change html files so that we auto-detect the lang now.

Merge branch 'detect_lang' of https://github.com/thierrytiti/converse.js into thierrytiti-detect_lang

Css fixes

main div conversejs
- left and width: The last 35px at bottom of the page is not clickable
- right: in some case (e.g. frame in div), the div is over the vertical
scrollbar

room-info:
- wrong placement on hover after information fetched on a room

These files can still be built by running `make build`. However we remove them
from version control because they bloat the repo, especially diffs of minified
files, which are large.

French Translation

French translation

Bugfix. fullname is null

Merge branch 'Placeholder-for-translation' of https://github.com/thierrytiti/converse.js into thierrytiti-Placeholder-for-translation

Conflicts:
	src/templates/toolbar.html

wrong callback argument mapping in XmppStatus initialize: fullname is
null

- Make sure the bare jid is used as roster contact id.
- Save the resource when creating a new roster contact
- In getWrappedChatBox, get roster item by bare jid
- In getWrappedChatBox, make sure the chat box is created from bare jid

add .cmd extensions to makefile.win

I was getting the following error while running make all on my windows machine
"""
node_modules/.bin/bower install
'node_modules' is not recognized as an internal or external command,
operable program or batch file.
make: *** [stamp-bower] Error 1
"""

This was resolved by adding the complete extension to the windows path.

Replace default en language to autodetection if no i18n setting is set.

Added login-panel placeholder and roster-item Name translations

This will allow to translate 'user@server' and 'password' in the login
screen and also in the roster-item tooltip, there's 'Name:' which can
now be translated

Fixed an error that appears when unload event is triggered

This happens when you load a page with converse and do not login to
the chat. It can be tested in converse.org preserving logs while
navigating to another page.
Inside clearSession there's a call to roster which is not initalized
and also another one to controlbox.save which is not set so it fails
with an url error during sync.

Manual login doesn't work when websocket_url is set and not bosh_service_url

It's already a while since we don't include an input for the bosh_service_url in the login panel.

Put the code that inserts a chat box into the page in it's own method,
so that it can be overridden from a plugin.