Added /* */ and // style comments
Added strings and other symbols to lexer

Added strings encased in double quotes ("...") and other symbols
Full list of new symbols:
+
-
*
/
(
)
=
;
:
.
,
{
}
[
]
>
<
>=
<=
&&
||
==
!=
Merge pull request #7 from kaitlinhuben/khuben/testing

Added comments, strings, and other symbols to lexer