Fixed another git race

Another version of #11, but on git tag, not git push.

Fixes #14

Fixed race-conditions on push

Fixes #11

Also, fixed a much more rare race condition, and added a little veendor calc fix.

Fixed tar errors when git tag is not found

Fixes #10

Fixing git-lfs checkout fail [2]

git lfs pull should be called after checkout, not before it
Hopefully, fixes #9 right

Fixing git-lfs checkout fail

For some reason after fetch+checkout git-lfs may not download actual files, leaving pointers in working directory.
This behavior is tricky and hard to catch, so I've just added "bulletproof" solution: running git lfs pull every time (if git-lfs is available), just to be safe.

Fixes #9

Backends errors API

Now, generic pull fails and bundle-not-founds are distinguished.

Fixed #7

git fetch fix

added '--tags' to git fetch for git-lfs

hash calculation fix

now hash will not be dependent on order of deps, which will save us from errors like #8

Fixed deps ↔︎ devDeps moving

Fixes #8

Added git-lfs availability check

Fixed #3