Add Solr configuration files (schema.xml) : control search tokenization.

[#60171250][#59938108]

https://www.pivotaltracker.com/story/show/60171250
https://www.pivotaltracker.com/story/show/59938108
search.rb  : relax on full_text cleanup.

Because schema.xml is handling word tokenization, we can be more lax
on escape characters.

[#60171250][#59938108]

https://www.pivotaltracker.com/story/show/60171250
https://www.pivotaltracker.com/story/show/59938108