refactor stripe charge to api wrapper
minor refactor of users#create
add vcr for testing stripe api
minor dom change to categories show view
refactor users controller tests to pass with charge stub
add selenium webdriver, database_cleaner for ui visual tests; refactor vcr; fix related bugs
remove no longer used cassettes
renaming and small test fixes for users controller
add capybara-webkit for quicker js testing; fix minor error for fill_in with capybara-webkit driver
user_sign_up_spec feature test
Merge pull request #12 from leeduan/mod11

Mod11 merged.