[angular plugin] Document override option

Closes #344
Mention company-mode backend in README
Add updated HTML manual
[emacs mode] Don't use (declare (special ...))

It doesn't work well with lexical-binding
(http://lists.gnu.org/archive/html/help-gnu-emacs/2014-07/msg00485.html),
and the code works just as well in every instance where it's been used
here.
[emacs mode] Include node in tern-command when on windows

Closes #332
Mark release 0.7.0
Bump version number post-0.7.0