Simple autocompelte to PHPStorm

Simple autocompelte to PHPStorm when using Faker\Factory::create()
More specific return types to auto complete
Polish addresses, personal identity number and pesel number generator
added comments and linked sources; use \Faker\Provider\DateTime::dateTimeThisCentury() for brithdate; added taxpayerIdentificationNumber()
Polish REGON number for companies, bank name and bank account number (IBAN)
copied Company.bankAccountNumber method to base Company class; updated readme with an example
regon in Company
Merge branch 'polish_personal_number_and_address' of github.com:nineinchnick/Faker into polish_personal_number_and_address

Conflicts:
	src/Faker/Provider/pl_PL/Company.php
reverted previous commit
restored Company.php deleted by mistake
Merge pull request #175 from nineinchnick/polish_personal_number_and_address

Polish addresses, personal identity number and pesel number generator
Merge pull request #170 from thallisphp/patch-1

Simple autocompelte to PHPStorm
add new Polish generators to readme.md
Merge pull request #180 from nineinchnick/pl_update_readme

add new Polish generators to readme.md
Fix coding standards
Add unique() modifier

* Add `BaseProvider::unique($reset = false)
* Add `UniqueGenerator` proxy class
* Refactor `optional()` tests for better coverage
* Merge `optional()` and `unique()` documentations

Closes #171
Merge pull request #182 from fzaninotto/unique

Add unique() modifier
credit cards
credit card generator
typo