Add `--no-cache` option to `fig build` (Closes #152)

Signed-off-by: Mark Steve Samson <hello@marksteve.com>
Add test for building with --no-cache

Signed-off-by: Mark Steve Samson <hello@marksteve.com>
Merge pull request #276 from marksteve/nocache

Add `--no-cache` option to `fig build` (Closes #152)