adding new attributeContains assertion and tests
Updated comments and messages
Fixing example. Fixing pass function to perform case insensitive test, and match beginning of string
Changing preview to use get instead of url
Changing the message for elementsPresent. The success case was too verbose
Merge pull request #15 from mobify/attribute-contains

adding new attributeContains assertion and tests
Merge pull request #18 from mobify/preview-get

Changing preview to use get instead of url
Update package.json
Merge pull request #20 from mobify/fix-elements-present

Changing the message for elementsPresent.
Update package.json
Merge