added: regular expressions to parse out all the data in the returned XML from melissa data; added the XML structure to be read from php unit
modified: fixed a bug where send command was set to the wrong variable name; fixed a bug where the zip code entered for sending a command wasn't set; changed method name from test zip code count test to a better naming convention

Signed-off-by: Scott Thundercloud <scotttc@gmail.com>
added: test city count method and get zip code list; xml for testing
added: get city buy list test method

Signed-off-by: Scott Thundercloud <scotttc@gmail.com>
Merge branch 'master' of github.com:how/melissadata
adds structure for builds and tests; updates instructions in readme