midterm submission

Query jambase api and report back on the next matching show.  Example:

bmath@xojito$ ./jamcli.rb
use directives to specify zip code and
artist id.  Type run to execute query.


e.g. > artist 1977 zip 10010
     > run

[]> artist 1977 zip 10010
["artist", "1977", "zip", "10010"]! run
{"artist"=>"1977", "zip"=>"10010"}
No shows found.
[]? quit

if you wanted to tighten up your code, you could consolidate lines 84 and 85 to `@results = @artists = []`