Some minor tweaks in views (see #343)

- Add sample links to main page
- Link to hbz lobid-organisation page from footer
- Link to hbz LOD product page from about page
- Remove copyright notice from footer
- Consistently use `<h2>` for headers
- Remove the 'X Documents' text if there is only one result
- Use the lowercased index name as the result page title
Link to english hbz LOD product page from lobid about page (#343)
Support restricting queries by type (see #317)

Uses `t` as the query parameter. The obvious choice of `type` is
currently not possible due to a bug in the Play framework [1], so
we will set up a rule in our Apache proxy to rewrite `type` to `t`
until the issue is resolved. We can then switch from `t` to `type`
internally and remove the rewrite, without affecting API clients.

[1] https://github.com/playframework/playframework/issues/2259
Remove RDF type from properties to use for detail resolution (#317)

The type of the main entity is always included, since that triple
has the main entity as subject. The resolved entities are all
included for their labels. Their types cause issues when
restricting queries by type. Since a solution that retains these
types would be quite involved, and we have no requirement for them
to be included, we simply remove them from the resolution config.
Highlight active navigation bar element (see #343, #347)
Remove link from `navbar-brand` element (see #343)
Merge pull request #344 from fsteeg/issue-343-views

Some minor tweaks in views
Merge pull request #346 from fsteeg/issue-317-type

Support restricting queries by type
Add oer-api as Play module (config only, code in separate git repo)

See https://github.com/hbz/oerworldmap/issues/9
Use master branch for build status image in README
Merge branch 'master' into hbz01-to-lobid_resource

Conflicts:
	lodmill-ui/app/models/Search.java