Raise haml error when compile check

[dlwr]

( This Pull Request has been continued from #188 (comment) )

raise the error in Hamlit::Parser when hamlit compile -c to check haml error.

$ cat invalid-haml-syntax.haml
%h1
  title
%div
 %span

Before this Pull Request

$ bundle exec exe/hamlit compile -c invalid-haml-syntax.haml
Syntax OK
$ echo $?
0

After this Pull Request

$ bundle exec exe/hamlit compile -c invalid-haml-syntax.haml
bundler: failed to load command: exe/hamlit (exe/hamlit)
(haml):4: Inconsistent indentation: 1 space used for indentation, but the rest of the document was indented using 2 spaces. (Hamlit::HamlSyntaxError)
...

$ echo $?
1

[k0kubun]

Thanks!