The git integration in pull can have better commit messages using the resource history from wavefront server

Right now the git integration with the pull command results in commit messages like this

```
hbaba@mbp-005063:~/misc/wavefront ((HEAD detached at d638aa8))$ git lola
* dbee3c1 () [2018-01-20 23:46:46 -0800] (master, 2018-01-20--23-48-23-pull-branch, 2018-01-20--23-47-43-pull-branch, 2018-01-20--23-46-34-pull-branch) Added files due to pull cmd:/Users/hbaba/box/src/skynet/wavectl/wavectl/main.py pull --inGit /Users/hbaba/misc/wavefront alert
* d638aa8 () [2018-01-20 23:37:10 -0800] (HEAD, 2018-01-20--23-37-00-pull-branch) Added files due to pull cmd:/Users/hbaba/box/src/skynet/wavectl/wavectl/main.py pull --inGit /Users/hbaba/misc/wavefront alert
* e8def81 () [2018-01-20 23:36:12 -0800] (2018-01-20--23-35-57-pull-branch) Added files due to pull cmd:/Users/hbaba/box/src/skynet/wavectl/wavectl/main.py pull --inGit /Users/hbaba/misc/wavefront alert
* e570f08 () [2018-01-20 23:28:26 -0800] (2018-01-20--23-28-15-pull-branch) Added files due to pull cmd:/Users/hbaba/box/src/skynet/wavectl/wavectl/main.py pull --inGit /Users/hbaba/misc/wavefront alert
* 443b4b8 () [2018-01-20 23:27:04 -0800] (2018-01-20--23-26-49-pull-branch) Added files due to pull cmd:/Users/hbaba/box/src/skynet/wavectl/wavectl/main.py pull --inGit /Users/hbaba/misc/wavefront alert
* 380738b () [2018-01-20 23:25:17 -0800] (2018-01-20--23-25-04-pull-branch) Added files due to pull cmd:/Users/hbaba/box/src/skynet/wavectl/wavectl/main.py pull --inGit /Users/hbaba/misc/wavefront alert
* 539efc1 () [2018-01-20 23:23:48 -0800] (2018-01-20--23-23-33-pull-branch) Added files due to pull cmd:/Users/hbaba/box/src/skynet/wavectl/wavectl/main.py pull --inGit /Users/hbaba/misc/wavefront alert
* f504619 () [2018-01-20 23:23:33 -0800] (1970-01-01--00-00-00-pull-branch) Initial commit with the README.md file```

This is not very useful to the users.

The v2 api of Wavefront has a "versions" endpoint. There the time and the author for each change to each resource can be seen.

It would be very very cool if the generated git history could read the version history for each resoruce from wavefront and mention the authors, and the modification times in the commit messages.

With that the resulting git repo in `pull --inGit ` command would be much more useful.

Start by tracing the pull --inGit command and the generated git history, then inspect the Wavefront v2 versions endpoint described in the issue. Done means generated commit messages include each resource change's author and modification time instead of only the generic pull command text.

Written by the indexing model from the issue text.