add support for different compilers

do not pull repos by default - fixes #587

fix off-by-one colspan for January - fixes #586

fix crash when author map contains blank lines - fixes #598

fix repo h1 generated even when no author has commits - fixes #585

replace working title with official project title

fix inconsistent use of tabs and spaces in indentation

(0) -10 -7 +7 +10 tip

mercurial