Update configuration files

- .editorconfig: change indent style and spacing.
- .gitignore: remove `md/` and ST2 project file.
- .jshint: add check for `forin`, `indent`, and `trailing` flags;
  remove `es5`.
- .npmignore: remove `md/` and add `test/`, `src-doc/`, and ST2 files.
- add ST2 project file.
Update documentation

- template.jst: remove since grunt-markdown is no more used.
- src-doc: add new template for generating the documentation.
- README.md: now is generated by the templating system.
Minor changes

- bump.js: improve comments and console messages, adjust indenting.
- bump_test.js: adjust indenting.
Update dependencies. Bump to 0.1.5

- Add grunt-sildoc and matchdep plugins
- Remove grunt-markdown plugin
- Bump to version 0.1.5