Merge branch 'release/0.4.3' into develop
Removed CHANGELOG.md.

Use the git log instead of maintaining a separate log.
Added manual installation guides.

Fixes #3.
Used syntax highlighting
Make eldoc documentation work when point is in a function argument list.

This is a simple hack: if the first call to (gethash ...) returns nil,
then go up one level of parens (when possible) and try whatever
pattern is found there instead.
Allow `completion-at-point' to use php-extras' cached function names.

This patch defines one new function, `php-extras-completion-at-point',
and adds it locally to the `completion-at-point-functions' hook in the
php-mode hook. This allows completing PHP function names using Emacs'
normal completion system, for people without auto-complete.
Deleted trailing whitespace.
Rewritten Makefile parts.
Bumped version number.
Merge branch 'release/0.4.4'