Fix error patterns in flake8 checker
Move point to beginning of buffer when reset is t
[Fix #47] Really jump to the highlighted column
Remove duplicated instructions

Configuration files for checkers are now explained generally, so there is no need to explain `.jshintrc` separately again.
Enable javascript checker in js2-mode and js3-mode

js2-mode https://github.com/mooz/js2-mode
js3-mode https://github.com/thomblake/js3-mode
Merge pull request #51 from L42y/javascript-modes

Enable javascript checker in js2-mode and js3-mode
Make config file variables buffer-local

I can't image why anyone would want set such a variable globally.
Fix highlighting for empty lines

For empty lines (mostly at the end of the buffer) start highlighting at
the end of the previous line to still add some visual indication about
the error.
Add custom variable to change error highlighting [#35]

Remove `flycheck-ignore-columns` in favor of
`flycheck-highlighting-mode` which provides a more flexible and future
proof approach.

`(setq flycheck-ignore-columns t)` hence becomes `(setq
flycheck-highlighting-mode 'lines)`.
Document error navigation