Merge branch 'release-0.1.4' into develop

* release-0.1.4:
  chore(version): bump version to 0.1.4 and update README.md
Merge branch 'master' into develop

* master:
  fix(lib): calculate commits based on email
Merge branch 'master' into develop
Merge branch 'master' into develop

* master:
  docs(readme): cleanup README.md
  docs(readme): fix markdown
style(indent): re-indent using two spaces
Merge branch 'style-fix-reindent-using-two-spaces' into develop

* style-fix-reindent-using-two-spaces:
  style(indent): re-indent using two spaces
refactor(index): make --version print value from package.json
style test: re-indent import
Squash merge of 'refactor-grunt-tasks' into 'develop'

  + re-indent tasks/ using 2 spaces
  + add tasks/ to list of watched directories
  + add $ grunt exec:cov_report
  + add lib-cov/ to grunt:clean and remove exec:cov_pre
  + add tasks/ to list of linted directories
chore deps: update chai, mocha and plato
test(opts): more tests for option handling
chore(package): remove npm prebublish script
chore grunt: update tasks
refactor lib: remove extra property
refactor lib: simplify option handling a bit
Merge branch 'refactor-path-handling' into develop

* refactor-path-handling:
  refactor lib: simplify option handling a bit
  refactor lib: remove extra property
test lib: cleanup
refactor index: exit with code 1 in case of error
chore package: make commander a dependency
docs: fix typo in README.md