char doesn't need any quote.

- add bug report link in README
- update intro doc for melpa
- add melpa badge in README
- add punctuation doc in README
- other minor doc updates

- add bug report link in README;
- add melpa badge in README;
- update intro doc in zero-input.el.in, this is used as melpa pkg
  description.

capital letter + dot + digit is now supported in auto convert.

to match the package name. update doc in README file.

since this is a backward incompatible change, I set version to v2.0.0.
all symbols and functions is now prefixed with zero-input.

This change is suggested by melpa reviewer.

only run check on master branch.
pkg branch is just for zero.el distribution.

minor, update doc.

- renamed zero.el back to zero-framework.el
- to build a dist, just run "make".
  the zero.el template is in zero.el.in
- zero.el is built and added to git repo in git pre-commit hook. it will
  be kept in master branch.
- fixed a few package-lint style warning.

split ert tests to separate files. These tests are not required in melpa
distribution.

- added zero-version variable in zero-framework.el