Support git tags and semver

[BobbyKostadinov]

I want to propose a new set of tasks to be added:

gulp patch
gulp feature
gulp release

Each of those is bumping the version according to semver standards, updates package.json and commits it. It also adds a relevant git tag.
This uses gulp-bump, gulp-tag-version, gulp-git

I've used this for all my projects that I've used load-common gulp task so if you find this set of tasks useful maybe I could submit a PR for this module?
This approach is useful for Continuous Integration and brings good practice of tagging each release / hot-fix as well as the practice to run automatic tests each time a new version is pushed out

By default, I would run lint, felint, test-cover and nice-package before each patch,feature, release to ensure that no tags / commits are wasted on broken code;

If this is something that might be useful to all that use this tool I would be happy to do a PR

[chmontgomery]

those seem like useful tasks that won't overly bloat the codebase. Feel free to make a PR