Merge pull request #127 from TomK32/patch-1

Update link to docs in the README
Misspelling of CC_BUILD_ARTIFACTS in manual
Missing a .html_safe for format_build_log
Merge pull request #128 from rubyruy/master

Misspelling of CC_BUILD_ARTIFACTS in manual
Merge branch 'upstream' into fix_git_clean_test
Merge branch 'fix_git_clean_test' into TomK32_patch-1