Fixes #1830

Fixes #1836

Conflicts:
	app/views/issues/_form.html.haml

Fix PostgreSQL setup instructions

The config skeleton for postgres is called `database.yml.postgresql`,
not `database.yml.postgres`.

grack auth bugfix: allow dots in reponame

Some grammatical improvements

Nothing too dramatic, just some improvements.

Api for merge request

Refer developers to the vagrant vm and remove out of date documentation.

Fix broken Note scopes with lambdas, 4.0 compat

Without lambdas, Date.today will be evaluated in the class body.
For it to have a running scope of last week etc, it will need to
be evaluated each time the scope is called.
In Rails 4.0, lambdas will be required for all scopes, so not a bad
idea to go ahead and change them all now.