Add zvdd transformations, which can be executed by metatext

- all three zvdd transfomations (collection, title-digital, title-print)
are now producible through "flow" files, which can be executed with the
metatext editor (s. https://github.com/lobid/lodmill/tree/master/metatext)
- add drawer transformations/zvdd to BuildPath so that ZvvdMarcIngest.java
can get the morph files there so that there is no redundancy of these files
- move the morph files needed for testing into test drawer
Merge pull request #25 from dr0i/zvdd

Add zvdd transformations, which can be executed by metatext
Add Xtext project nature to lodmill-rd (for Metatext & DOT editors)
Add simple DOT pipe encoder, refactor N-Triple encoder for reuse
Update Metatext dependencies for DOT pipe support and vis. w/ Zest
Update sample and documentation with stream-tee and DOT encoder
Merge pull request #26 from fsteeg/dot

DOT pipe encoder and visualization with Zest
Fix a Bug - Subjects were literals, but must be URIs
Update lodmill-ld scripts to work with local directory structure
Initial API for searching lobid-resources via ID

This commit adds API to search for lobid-resources based on IDs
currently present in our data: lobid-HT numbers, ISBN10, ISBN13.

To avoid conflicts with the existing author search (which does
some fancy stuff to allow search queries with life dates), this
also introduces a new parameter ('category') to specify where to
search ('author' vs. 'id').

The UI providing documentation and sample usage of the API is
updated and allows for the selection of indexes and their
corresponding categories.
Add visualization of zvdd graphs
Merge pull request #27 from fsteeg/id-search

Initial API for searching lobid-resources via ID
Merge pull request #28 from dr0i/zvdd

Zvdd