0.1.3 relaesed

• fixed error message of exception for reason object.

0.1.2 relaesed

• Add checkout_page method to selenium.Case.
• Polling module is allow from selenium package as rudiment.
• Bug fixes.

0.1.1 relaesed

• Program class is suported stream param for signtaure of init method
• Worning message fix

0.1.0 relaesed

• begin and finish method of step by step case called with step methos on flow context
• reworked selenium extension
• added new assertion methods
• bug fixes