Add ncbi tree generator.
Split rake tasks into seperate files by namespace

The original file, vecnet.rake, is getting quite long. This should
make it easier to find tasks
adding species table migration
adding species table migration
Merge branch 'species-facet'
adding new species to descMetadata and related form fields
More work on NCBI taxonomy files

* add rake task to create tree and synonym files
* add name.dmp parser
* add tests
* rename original file to ncbi_tools.rb
adding model for species
Add species model importing code
Hook import into rake task.

Maybe should add timing benchmark to it.
fixing incorrect description
prototyping copy subjects to species if it is a species
Merge branch 'species-facet' of github.com:banurekha/vecnet into species-facet
adding species to citation as well
removing duplicate entries from species array
adding rake task to copy species from subject
Starting facet tree generating code. WIP.
Finish facet tree creation, hook into rake import task.
Fix species facet generation
Remove rank caching and fix bad data in test suite