This patch introduces a new export method for sending metrics to
__Riemann__ server using _TCP_ protocol. The module can be enabled like
all the other exports in __Glances__, specifying the `--export-riemann`
option.

Sending metrics to Riemann requires
[bernhard](https://github.com/banjiewen/bernhard) that is
the most popular _Riemann client_ written in python.

In the configuration file you can only specify the `host` and `port`
that riemann is listening for new connections on. Later new options are
planned to be added like __SSL__ support and __UDP__.

Documentation and manpages are refreshed according to the modifications
in the config options and introducing the usage of Riemann export.
Signed-off-by: NGergő Nagy <grigori.grant@gmail.com>

Update all affected imports accordingly.

See https://groups.google.com/forum/#!topic/glances-users/1i3ugQX2gVA.

Now, args.disable_bold == True actually means bold is disabled.
The same goes for disable_bg.

Adds new command-line option `--disable-bg` to address issue #68
(readability problems with white text over coloured backgrounds).

Remove 'glances_' prefix from filenames.

Disable CPU, MEM, SWAP and LOAD done. Had to change the glances_curses module to compute the QL size

Replace the duplicate _encoded_password method.
Fix some wrong comments.
Remove unused method in glances_main.

Simply doesn't work as expected.

To define a client/server password, just use --password.