remove api_querry variable and replace with set_querry() function.

set_querry() constructs a valid set of api parameters with default values and some input validation to deal with date vs begin/end_date parameter choice.
Generalized set_querry() function with logic to work with different date and range specifications.

some options not yet implemented.
add a function unpack_full() to return the whole list of data with no parsing
Merge branch 'get-api-data' of github.com:johnny-lighthouse/tides into get-api-data