title null should be a string;
add multiple-permalink option; fix bug; get permalink in any page;
now you can use an permalink array or a multiline permalink string to
generate more than one page from the same template;
also you can read permalink variable in all pages;
permalink is the source path if the page does not have a permalink;
add test cases;
standardize permalink output; also fix tests;
should have a path separator as prefix;
strip all 'index.html' at the end of permalink string;
put all tests in one file;
add escape {{}}; fix little bug; add multiple tests;
clean up comments;
fix /index.html bug;
update README;
bumped version to 0.1.0