Characters Counter

+ Added  [jQuery Textarea Characters Counter Plugin]( http://roy-jin.appspot.com/jsp/textareaCounter.jsp) support
+ Added initial Greet Form package (in future — auxiliary utilities for some forms elements)
+ Enabled Characters Counter Plugin in `<gleez>/contact` page

I used [HTML5 data-* Attributes](http://api.jquery.com/data/#data-html5) for passing parameters to `Greet Form` which, in turn, calls ` Characters Counter` with the chosen parameters from  data-* attribute:

```php
Form::input('subject', '', array(
	'class' => 'form-control',
	'autofocus',
	'id' => 'countInput',
	'data-max-chars' => $config->subject_length,
	'data-display-format' => __(':format words', array(':format' => '#input/#max | #words '))
))

...

Form::textarea('body', '', array(
	'class' => 'form-control',
	'rows' => 6,
	'id' => 'countTextarea',
	'data-max-chars' => $config->body_length,
	'data-display-format' => __(':format words', array(':format' => '#input/#max | #words '))
))
```

Configuration as usual — `config/contact`.  In this regard nothing is changed. 

- [ ] Need to add a visual setting to admin dashboard
- [ ] Need optimize code
- [ ] Need create minimized version of  [jQuery Textarea Characters Counter Plugin]( http://roy-jin.appspot.com/jsp/textareaCounter.jsp)

@sandeepone This draft. But it works. You should pay attention to it. Maybe you can make it more versatile.

P.S. Please pay attention to the mechanism of string localization. Perhaps it makes sense to go the same way in the localization DataTables