Bulk improvements, bug fixes

• Remove needless .gitkeep files
• Change .gitignore file to allow using phpStorm to develop this package
• Use Closure route instead of the RuleController class to make Route become extendable with extend() method
• Use ServiceProvider::mergeConfigFrom method to load package configuration instead of loading config file manually
• Import jQuery validation additional methods to asset JS file
• Pass laravel App facade instances (e.g. $app['url'], $app['translator'], $app['encrypter'],...) to converter classes
  to remove Helper class, and we can customize message-method with our custom plugin
• Fix all minor bugs:
  • Get the raw attribute name not ending with [] like foo[][bar]
  • Get user friendly validation message with friendly attribute name like laravel Validator
  • Using URL::to to correct routing path
  • Instance converter classes correctly with constructor of abstract Converter to use custom plugin
  • Get type of input correctly for numeric and file types
  • Parses laravel validation rule correctly for multi-parameters rules like: between, mimes, unique,...
  • Pass parameters correctly for Route::convert() method to make Route extendable via extend()
  • Validation rule alphanum should be named as alpha_num
  • Add data-msg-accept for validation rule image
  • Fix validation rule integer with data-rule-integer instead of data-rule-number
  • Rule same should be data-rule-equalto=":input[name='other']" instead of "input[name='other']"
  • alpha and alpha_num rules should not allow whitespace to make them compatible with laravel Validator
  • Correct string format for vsprintf() from %1s,%2s to %1$s,%2$s
• Improvements:
  • Allow custom namespace for custom Converter plugin
  • Allow HTML5 attributes to pass jQuery validation rules such as: required, pattern, maxlength, min
  • Allow HTML5 input types to pass jQuery validation rules like: <input type="url", <input type="email",... instead of attribute data-rule-*="true"
  • Only append validation message attribute data-msg-* when validation rule exists
  • Allow multiple jQuery remote rules such as: unique + active_url
  • Use jQuery validation message format like: The field must be between {0} and {1}., The field must be a date after {0}.,...
    So, we can change data-rule-* value at the client-side via JavaScript
  • No need to override method FormBuilder::checkable() because it call to FormBuilder::input() method
  • Format validation message with custom attributes for other, values parameters, those are used by same, required_with rules
• Support more laravel validation methods:
  • different, before, after, mimes
  • required_with, required_without
  • active_url
• Implement unit-tests for this package classes (except ServiceProvider one)
• Update README document for those new improvements
• And some more refactors, improvements

by @nthachus