<!--- Provide a general summary of the issue in the Title above -->
## Expected Behavior
Tests shouldn't fail at the `git clone` step
## Current Behavior
This error happens during downloading of .dcm files by the Travis server
```
Error downloading object: tests/assets/test_image_data/full/LIDC-IDRI-0001/1.3.6.1.4.1.14519.5.2.1.6279.6001.298806137288633453246975630178/1.3.6.1.4.1.14519.5.2.1.6279.6001.179049373636438705059720603192/000101.dcm (75aa4c8): Smudge error: Error downloading tests/assets/test_image_data/full/LIDC-IDRI-0001/1.3.6.1.4.1.14519.5.2.1.6279.6001.298806137288633453246975630178/1.3.6.1.4.1.14519.5.2.1.6279.6001.179049373636438705059720603192/000101.dcm (75aa4c8288eb31e7f6a40b8103019f664cfdd4e5b80e7a1e5d3d842c65cecfa5): batch response: Rate limit exceeded: https://github.com/concept-to-clinic/concept-to-clinic.git/info/lfs/objects/batch
Errors logged to /home/travis/build/concept-to-clinic/concept-to-clinic/.git/lfs/objects/logs/20170824T153416.634441969.log
Use `git lfs logs last` to view the log.
error: external filter 'git-lfs filter-process' failed
fatal: tests/assets/test_image_data/full/LIDC-IDRI-0001/1.3.6.1.4.1.14519.5.2.1.6279.6001.298806137288633453246975630178/1.3.6.1.4.1.14519.5.2.1.6279.6001.179049373636438705059720603192/000101.dcm: smudge filter lfs failed
warning: Clone succeeded, but checkout failed.
You can inspect what was checked out with 'git status'
and retry the checkout with 'git checkout -f HEAD'
The command "eval git clone --depth=50 https://github.com/concept-to-clinic/concept-to-clinic.git concept-to-clinic/concept-to-clinic " failed. Retrying, 2 of 3.
fatal: destination path 'concept-to-clinic/concept-to-clinic' already exists and is not an empty directory.
The command "eval git clone --depth=50 https://github.com/concept-to-clinic/concept-to-clinic.git concept-to-clinic/concept-to-clinic " failed. Retrying, 3 of 3.
fatal: destination path 'concept-to-clinic/concept-to-clinic' already exists and is not an empty directory.
The command "eval git clone --depth=50 https://github.com/concept-to-clinic/concept-to-clinic.git concept-to-clinic/concept-to-clinic " failed 3 times.
The command "git clone --depth=50 https://github.com/concept-to-clinic/concept-to-clinic.git concept-to-clinic/concept-to-clinic" failed and exited with 128 during .
Your build has been stopped.
```
## Possible Solution
<!--- Not obligatory, but suggest a fix/reason for the bug, -->
Can't help here, not familiar with LFS
## Steps to Reproduce
<!--- Provide a link to a live example, or an unambiguous set of steps to -->
<!--- reproduce this bug. Include code to reproduce, if relevant -->
1. https://travis-ci.org/concept-to-clinic/concept-to-clinic/builds/268024624?utm_source=github_status&utm_medium=notification
## Context (Environment)
<!--- How has this issue affected you? What are you trying to accomplish? -->
<!--- Providing context helps us come up with a solution that is most useful in the real world -->
Can't get my PRs to be green because of this.
## Detailed Description
<!--- Provide a detailed description of the change or addition you are proposing -->
## Possible Implementation
<!--- Not obligatory, but suggest an idea for implementing addition or change -->
## Checklist before submitting
- [ ] I have confirmed this using the officially supported Docker Compose setup using the `local.py` configuration and ensured that I built the containers again and they reflect the most recent version of the project at the `HEAD` commit on the `master` branch
- [ ] I have searched through the other currently open issues and am confident this is not a duplicate of an existing bug
- [ ] I provided a **minimal code snippet** or list of steps that reproduces the bug.
- [ ] I provided **screenshots** where appropriate
- [ ] I filled out all the relevant sections of this template