Fix parsing issue with quoted shorthand values

Fixes #174.  The problem was that if multiple equal
signs are present in a key/val pair (if the value has
an equal sign) then we would hit this error.  I double
checked the other parsing parts of argprocess, they all
properly use '.split("=", 1)'.

This also required updated the csv parsing to handle the
case where you quote a value without commas, e.g. foo="bar=baz".
Merge branch 'fix-174' into develop

* fix-174:
  Fix parsing issue with quoted shorthand values
Updating test for new EC2 API version in response.  Related to https://github.com/boto/botocore/commit/f568b63c4afd5b96bb23bdba8bbcd421abbc1a76.
Merge branch 'update-ec2-test' of git://github.com/garnaat/aws-cli into garnaat-update-ec2-test