Implement keep file for VPN clusters

Changelog for v0.0.1:

Commits
bd046ca Implement keep file for #6 by @alexellis

Changes: v0.0.1-rc4...v0.0.1

Generated by Derek

Add compression to release downloads

Changelog for v0.0.1-rc4:

• PR #5 add compression to binaries by @rgee0

Commits
5109a6f add compression to binaries by @rgee0
9d3d9e5 Update README.md by @alexellis
65f621e Clarify write flag by @alexellis
0c5f2ff Update README.md by @alexellis
fe7b7a5 Update README.md by @alexellis
af5b02f Update README.md by @alexellis

Changes: v0.0.1-rc3...v0.0.1-rc4

Generated by Derek

Don't delete contexts when all of them are unavailable

Changelog for v0.0.1-rc3:

Commits
bd329c3 Don't remove if there are zero or no reachable contexts by @alexellis
8ed8704 Add notes on daily trim by @alexellis
f5da53c Add Q&A by @alexellis
d339c6f Add .DEREK.yml file for release notes by @alexellis
9fc7d0c Allow artifact upload by @alexellis
bbf47c6 Inject version to correct package by @alexellis
31c1515 Add README by @alexellis
695923d Initial by @alexellis

Changes: https://github.com/alexellis/kubetrim/commits/v0.0.1-rc3

Generated by Derek

v0.0.1-rc2: Add .DEREK.yml file for release notes

Changelog for v0.0.1-rc2:

Commits
d339c6f Add .DEREK.yml file for release notes by @alexellis
9fc7d0c Allow artifact upload by @alexellis
bbf47c6 Inject version to correct package by @alexellis
31c1515 Add README by @alexellis
695923d Initial by @alexellis

Changes: https://github.com/alexellis/kubetrim/commits/v0.0.1-rc2

Generated by Derek

v0.0.1-rc1

Add README

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>