Remove unused gender argument from CZBirthNumberField.clean
Add normalization to Lithuanian (lt) postal code field

Both "12345" and "LT-12345" now get normalized to "LT-12345", like the
Latvian postal code.
Merge pull request #69 from intgr/lt

Add normalization to Lithuanian (lt) postal code field
Merge pull request #67 from intgr/cz

Remove unused gender argument from CZBirthNumberField.clean
Add Latvian (lv) flavor with Latvian municipalities

110 municipalities and 9 republican cities.

Translations will come later.
Add Latvian (lv) postal code field (LV-XXXX)
Add Latvian (lv) personal code field (XXXXXX-XXXXX)
Add Estonian (ee) flavor with zipcode, counties and personal ID code fields
Merge pull request #70 from intgr/ee

Add Estonian (ee) flavor with zipcode, counties and personal ID code fields
Merge pull request #68 from intgr/lv

Add Latvian (lv) flavor: postal code, personal code and municipality fields