Fixes #43

Separate tasks into smaller units
Remove copy:wp from html watch task since it ignores *.html files anyway
Update README.md
Change default task to 'watch' one
Update docs images
Fixes #48
Merge pull request #49 from yuijim/issue-48

Fixes #48
Merge pull request #44 from yuijim/dry-grunt-tasks

Fixes #43
Fixes #41
Fixes #47
copy tasks tweaks
Merge pull request #53 from yuijim/modernizr-shiv-improvements

Modernizr shiv improvements
Fixes #54
Fixes #52
Merge pull request #55 from yuijim/issue-52

Fixes #52
Fixes #51
Fixes #46