Inline comments not handled properly

The example below:

```tr \\0 \\n <"in1" |
sed 's|^.*/||' |
# This is a comment
awk '{s += length($1); n++} END {
if (n>0)
print s / n;
else
print 0; }'
```

Gets parsed as:

```tr \\0 \\n <"in1" | sed 's|^.*/||' | # This is a comment awk '{s += length($1); n++} END { if (n>0) print s / n; else print 0; }'```

Similarly `echo foo # bar` will appear as is inside the Rikerfile.

We need to get rid of comments in these cases.