non-comment AND non-empty line is start of message

In case there are blank lines between comment blocks, as happens after
merge+conflict, git-commit-find-pseudo-header-position should skip over
the blank lines too.
don't save comments in commit message

Only save and restore up to the pseudo-header position.
README.md: remove obsolete note about magit-log-edit-mode
Merge branch 'pr/no-save-comment4'
Merge branch 'pr/test-msg-hist'
Fix package header of gitattributes-mode.el
Merge pull request #81 from yasuyk/fix-package-header

Fix package header of gitattributes-mode.el