configure capybara and selenium for acceptance tests
acceptance test for sign-in
acceptance test for post CRUD opertaions
Merge branch 'master' of https://github.com/rohandaxini/knowbuddy into acceptance_test

Conflicts:
	Gemfile.lock
user activity spec
Merge branch 'master' of https://github.com/rohandaxini/knowbuddy into acceptance_test
Merge pull request #9 from rohandaxini/acceptance_test

Acceptance test