bug fixes, minor changes.

* reset timer interval within a round to decrement at 1 second ticks
instead of 30

* made slight naming change on player_data function. functionality
should remain the same.

* updated show_prompt function to have a duration parameter, though this
function is still in development.

* updated Makefile so that all the object files are removed on `make
clean` operation.
Merge branch 'master' of https://github.com/spockNinja/anagrams

Conflicts:
	src/client.c
fixed more merge conflicts