* Change 'add' to add to .gitignore by default.
Also add _message() function and improve output from 'git-secret-add',
alter tests for new code behavior, and update docs.
* change tests since 'add' always adds to .gitignore
* improve output: prepend more message with 'git-secret:'.
* update man page for git-secret-add
* perform lint/shellcheck tests on travis mac builds
* move osx builds first in travis
* install shellcheck on macos
* show if the lint test passed or failed
* don't have travis install ruby 2.6 on osx for now
* use pgrep & kill, not ps+gawk+regex+system+kill
* install shellcheck and enable lint on macos/brew.
* add shellcheck fixes and exception
* reorder CHANGELOG entries
* Support SECRETS_VERBOSE env var in addition to -v
* don't use --quiet when decrypting in verbose mode
* show output of gpg encryption in verbose mode
* add tests for SECRETS_VERBOSE env var set to 0 and 1
* update changelog, reorder entries.
* add tests for 'cat' and 'hide' with SECRETS_VERBOSE=1
* respect SECRETS_DIR and SECRETS_EXTENSION in tests
* add line regarding fixes to CHANGELOG.md
* test with non-standard SECRETS_EXTENSION
* Add details about init, mention SECRETS_EXTENSION in init page
* update git-secret-init man page
* clarification about killperson and secrets, rephrasing.
* how to develop without docker/test-kitchen
* doc changes about gh-pages branch. other clarifications.
* OSX has been renamed MacOS (except in travis-ci)
* have lint target run shellcheck over tests
* lint and fix tests/ since shellcheck knows bats
* lint and fix tests/ since shellcheck knows bats
* revert debug output
* changes for shellcheck
* revert unintended change
[tests/_test_base.bash]
* use 'local' for user/filename vars, not 'export'
* add note about Shellcheck and tests/
* local can only be used in functions - use export
* restore shbang edited in error
* code style in CONTRIBUTING.md and PR template
* make link to CONTRIBUTING.md in .github/PULL_REQUEST_TEMPLATE.md
* mention shellcheck and 'make lint'
* mention that you should update CHANGELOG.md
* mention spellchecking with aspell
* more spelling fixes
* add to CHANGELOG about style guide/dev philosophy
* remind contributors to update .ronn file/man page
* test that hiding secret with expired key fails
* add test of user key without username.
* revert to performing most tests with 'user1'.
* move user4 private/public key fixtures
* factor code fetching emails from keyrings, add comments.
* use factored _warn_or_abort()
* add to, clean up, and clarify comments.
Changes:
1. Now everything is tested inside the `docker`-containers and `OSX` images on `travis`.
2. We now have `CONTRIBUTING.md` and `LICENSE.md`. `README.md` is also changed.
3. We have a brand logo.
4. We have autodeploy to `bintray`.
5. Everything is `shellcheck`ed (except `tests/`).
Closes#32#33#34#35#39
