starting to accept float numbers and dot

Introducing the test to float numbers that starting with period. Also,
the dot literal is being read. The dot literal is used to end a sequence
of commands in the future grammar.
Testing the messages when exiting

Passing to test the "Unexpected end of file" and
"Unexpected end of line" errors. Also, I fixed the
name of commentary test that was missing a 'm'.
Testing with a single line comment
trying resolve a warning from bison 2.5