update: Added inhereted requirement

* Added ``requests`` into the list of requirements.

Signed-off-by: mr.Shu <mr@shu.io>
update: Added another requirement

* It seems cssselect is also required in order for lxml to work
  properly.

Signed-off-by: mr.Shu <mr@shu.io>
eval: Added eval command

* Added a simple eval command which evaluates usper specified
  expression which can contain calls to functions from the `math`
  module.

* Added a sandboxed environment which should prevent abuse of this
  command.

* Added a bit longer docstring that could serve as an example of the
  formatting brutal plugins could use in the future.

Signed-off-by: mr.Shu <mr@shu.io>
update: Fixed bugs in eval

* Fixed the `abs` function.
* Fixed `eval` being called without arguments.

Signed-off-by: mr.Shu <mr@shu.io>
mhd: Fixed dash separation bug

* Fixed a bug which caused commands like

        !mhd X - Y - 1000

  to be parsed incorrectly by not stripping the whitespace left by the
  split.

Signed-off-by: mr.Shu <mr@shu.io>
update: Refactored URL Matcher using requests

* Replaced urllib with requests
* Fixes #23

Signed-off-by: mr.Shu <mr@shu.io>
update: Added storage usage example

* Added example usage of `open_storage` function.

Signed-off-by: mr.Shu <mr@shu.io>
janitoring: Fixed not too good comment

* It should look a bit better now, cc @JakubN

Signed-off-by: mr.Shu <mr@shu.io>
travel: cpsk plugin

* searches for bus/train lines in Slovakia
* ability to match query or use cmds !bus or !vlak
* time and date specification feature

Signed-off-by: Adrian Matejov <a.matejov@centrum.sk>
Countdown: Removed trailing spaces.

Signed-off-by: Jakub Novak <jakub.novak@gmail.com>

Countdown: Added output msg decorator.

Signed-off-by: Jakub Novak <jakub.novak@gmail.com>

Countdown: Added named constants.

Signed-off-by: Jakub Novak <jakub.novak@gmail.com>

Countdown: Removed trailing spaces.

Signed-off-by: Jakub Novak <jakub.novak@gmail.com>

Countdown: Code can now be read as poetry.

 * Renamed function to a more appropriate name.
 * Added docstring.

Signed-off-by: Jakub Novak <jakub.novak@gmail.com>

Countdown: Fixed apostrophes.

Signed-off-by: Jakub Novak <jakub.novak@gmail.com>

Countdown: Added variable for better readability.

Signed-off-by: Jakub Novak <jakub.novak@gmail.com>

fix: Hotfixed problem with countdown

* Hotfixed a problem JakubN introduced when putting readability before
  functionality.

Signed-off-by: mr.Shu <mr@shu.io>